20621223315 has 192 divisors, whose sum is σ = 45664819200. Its totient is φ = 8360755200.

The previous prime is 20621223289. The next prime is 20621223349. The reversal of 20621223315 is 51332212602.

It is a happy number.

20621223315 is a `hidden beast` number, since 2 + 0 + 621 + 2 + 2 + 3 + 31 + 5 = 666.

It is not a de Polignac number, because 20621223315 - 2⁷ = 20621223187 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 26815251 + ... + 26816019.

It is an arithmetic number, because the mean of its divisors is an integer number (237837600).

Almost surely, 2^20621223315 is an apocalyptic number.

20621223315 is an abundant number, since it is smaller than the sum of its proper divisors (25043595885).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20621223315 is a wasteful number, since it uses less digits than its factorization.

20621223315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 978 (or 975 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

Adding to 20621223315 its reverse (51332212602), we get a palindrome (71953435917).

The spelling of 20621223315 in words is "twenty billion, six hundred twenty-one million, two hundred twenty-three thousand, three hundred fifteen".