21221344101153 has 32 divisors (see below), whose sum is σ = 33142841856000. Its totient is φ = 11826235370880.

The previous prime is 21221344101149. The next prime is 21221344101157. The reversal of 21221344101153 is 35110144312212.

It is an interprime number because it is at equal distance from previous prime (21221344101149) and next prime (21221344101157).

It is not a de Polignac number, because 21221344101153 - 2² = 21221344101149 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21221344101153.

It is not an unprimeable number, because it can be changed into a prime (21221344101157) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37980403 + ... + 38535096.

It is an arithmetic number, because the mean of its divisors is an integer number (1035713808000).

Almost surely, 2^{21221344101153} is an apocalyptic number.

It is an amenable number.

21221344101153 is a deficient number, since it is larger than the sum of its proper divisors (11921497754847).

21221344101153 is a wasteful number, since it uses less digits than its factorization.

21221344101153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76515837.

The product of its (nonzero) digits is 5760, while the sum is 30.

Adding to 21221344101153 its reverse (35110144312212), we get a palindrome (56331488413365).

The spelling of 21221344101153 in words is "twenty-one trillion, two hundred twenty-one billion, three hundred forty-four million, one hundred one thousand, one hundred fifty-three".