21290829315 has 32 divisors (see below), whose sum is σ = 38942830080. Its totient is φ = 9730193664.

The previous prime is 21290829293. The next prime is 21290829319. The reversal of 21290829315 is 51392809212.

It is not a de Polignac number, because 21290829315 - 2⁸ = 21290829059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21290829319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 369967 + ... + 423623.

It is an arithmetic number, because the mean of its divisors is an integer number (1216963440).

Almost surely, 2^21290829315 is an apocalyptic number.

21290829315 is a deficient number, since it is larger than the sum of its proper divisors (17652000765).

21290829315 is a wasteful number, since it uses less digits than its factorization.

21290829315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57451.

The product of its (nonzero) digits is 77760, while the sum is 42.

The spelling of 21290829315 in words is "twenty-one billion, two hundred ninety million, eight hundred twenty-nine thousand, three hundred fifteen".