21729215022 has 64 divisors (see below), whose sum is σ = 44647884288. Its totient is φ = 7047936000.

The previous prime is 21729215021. The next prime is 21729215041. The reversal of 21729215022 is 22051292712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21729215021) 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, 28553122 + ... + 28553882.

It is an arithmetic number, because the mean of its divisors is an integer number (697623192).

Almost surely, 2^21729215022 is an apocalyptic number.

21729215022 is an abundant number, since it is smaller than the sum of its proper divisors (22918669266).

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

21729215022 is a wasteful number, since it uses less digits than its factorization.

21729215022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1625.

The product of its (nonzero) digits is 10080, while the sum is 33.

The spelling of 21729215022 in words is "twenty-one billion, seven hundred twenty-nine million, two hundred fifteen thousand, twenty-two".