101210111212221 has 18 divisors (see below), whose sum is σ = 160690800998910. Its totient is φ = 61339461340080.

The previous prime is 101210111212163. The next prime is 101210111212247. The reversal of 101210111212221 is 122212111012101.

It is a happy number.

101210111212221 is a `hidden beast` number, since 1 + 0 + 121 + 0 + 111 + 212 + 221 = 666.

It can be written as a sum of positive squares in only one way, i.e., 90002011589721 + 11208099622500 = 9486939^2 + 3347850^2 .

It is not a de Polignac number, because 101210111212221 - 2⁶ = 101210111212157 is a prime.

It is a super-2 number, since 2×101210111212221² (a number of 29 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 101210111212194 and 101210111212203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101210111212261) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 46469287806 + ... + 46469289983.

Almost surely, 2^{101210111212221} is an apocalyptic number.

101210111212221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

101210111212221 is a deficient number, since it is larger than the sum of its proper divisors (59480689786689).

101210111212221 is a wasteful number, since it uses less digits than its factorization.

101210111212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92938577817 (or 92938577803 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 101210111212221 its reverse (122212111012101), we get a palindrome (223422222224322).

The spelling of 101210111212221 in words is "one hundred one trillion, two hundred ten billion, one hundred eleven million, two hundred twelve thousand, two hundred twenty-one".