21621110153 has 8 divisors (see below), whose sum is σ = 22926470688. Its totient is φ = 20319475264.

The previous prime is 21621110117. The next prime is 21621110201. The reversal of 21621110153 is 35101112612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21621110153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21621110113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 919451 + ... + 942672.

It is an arithmetic number, because the mean of its divisors is an integer number (2865808836).

Almost surely, 2^21621110153 is an apocalyptic number.

It is an amenable number.

21621110153 is a deficient number, since it is larger than the sum of its proper divisors (1305360535).

21621110153 is a wasteful number, since it uses less digits than its factorization.

21621110153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1862823.

The product of its (nonzero) digits is 360, while the sum is 23.

Adding to 21621110153 its reverse (35101112612), we get a palindrome (56722222765).

The spelling of 21621110153 in words is "twenty-one billion, six hundred twenty-one million, one hundred ten thousand, one hundred fifty-three".