101212110021 has 64 divisors (see below), whose sum is σ = 159362150400. Its totient is φ = 56467756800.

The previous prime is 101212110019. The next prime is 101212110023. The reversal of 101212110021 is 120011212101.

It is an interprime number because it is at equal distance from previous prime (101212110019) and next prime (101212110023).

It is not a de Polignac number, because 101212110021 - 2¹ = 101212110019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 101212109979 and 101212110006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101212110023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 21131895 + ... + 21136683.

It is an arithmetic number, because the mean of its divisors is an integer number (2490033600).

Almost surely, 2^101212110021 is an apocalyptic number.

101212110021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

101212110021 is a deficient number, since it is larger than the sum of its proper divisors (58150040379).

101212110021 is a wasteful number, since it uses less digits than its factorization.

101212110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5770.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 101212110021 its reverse (120011212101), we get a palindrome (221223322122).

The spelling of 101212110021 in words is "one hundred one billion, two hundred twelve million, one hundred ten thousand, twenty-one".