101221111011021 has 4 divisors (see below), whose sum is σ = 134961481348032. Its totient is φ = 67480740674012.

The previous prime is 101221111010923. The next prime is 101221111011043. The reversal of 101221111011021 is 120110111122101.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 101221111011021 - 2¹³ = 101221111002829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101221111011071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16870185168501 + ... + 16870185168506.

It is an arithmetic number, because the mean of its divisors is an integer number (33740370337008).

Almost surely, 2^{101221111011021} is an apocalyptic number.

It is an amenable number.

101221111011021 is a deficient number, since it is larger than the sum of its proper divisors (33740370337011).

101221111011021 is an equidigital number, since it uses as much as digits as its factorization.

101221111011021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33740370337010.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 101221111011021 its reverse (120110111122101), we get a palindrome (221331222133122).

The spelling of 101221111011021 in words is "one hundred one trillion, two hundred twenty-one billion, one hundred eleven million, eleven thousand, twenty-one".