101212211221 has 16 divisors (see below), whose sum is σ = 114279984000. Its totient is φ = 88792177600.

The previous prime is 101212211153. The next prime is 101212211281. The reversal of 101212211221 is 122112212101.

It is a cyclic number.

It is not a de Polignac number, because 101212211221 - 2¹⁷ = 101212080149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 101212211195 and 101212211204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101212211281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 540336 + ... + 703126.

It is an arithmetic number, because the mean of its divisors is an integer number (7142499000).

Almost surely, 2^101212211221 is an apocalyptic number.

101212211221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

101212211221 is a deficient number, since it is larger than the sum of its proper divisors (13067772779).

101212211221 is a wasteful number, since it uses less digits than its factorization.

101212211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164780.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 101212211221 its reverse (122112212101), we get a palindrome (223324423322).

The spelling of 101212211221 in words is "one hundred one billion, two hundred twelve million, two hundred eleven thousand, two hundred twenty-one".