20152224021 has 16 divisors (see below), whose sum is σ = 27732902400. Its totient is φ = 13009978608.

The previous prime is 20152224017. The next prime is 20152224047. The reversal of 20152224021 is 12042225102.

It is not a de Polignac number, because 20152224021 - 2² = 20152224017 is a prime.

It is a super-2 number, since 2×20152224021² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20152224061) 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, 837801 + ... + 861518.

It is an arithmetic number, because the mean of its divisors is an integer number (1733306400).

Almost surely, 2^20152224021 is an apocalyptic number.

It is an amenable number.

20152224021 is a deficient number, since it is larger than the sum of its proper divisors (7580678379).

20152224021 is a wasteful number, since it uses less digits than its factorization.

20152224021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1699448.

The product of its (nonzero) digits is 640, while the sum is 21.

Adding to 20152224021 its reverse (12042225102), we get a palindrome (32194449123).

The spelling of 20152224021 in words is "twenty billion, one hundred fifty-two million, two hundred twenty-four thousand, twenty-one".