21671027252 has 24 divisors (see below), whose sum is σ = 43366088640. Its totient is φ = 9282432960.

The previous prime is 21671027249. The next prime is 21671027291. The reversal of 21671027252 is 25272017612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162977 + ... + 264392.

It is an arithmetic number, because the mean of its divisors is an integer number (1806920360).

Almost surely, 2^21671027252 is an apocalyptic number.

It is an amenable number.

21671027252 is an abundant number, since it is smaller than the sum of its proper divisors (21695061388).

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

21671027252 is a wasteful number, since it uses less digits than its factorization.

21671027252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429191 (or 429189 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 35.

The spelling of 21671027252 in words is "twenty-one billion, six hundred seventy-one million, twenty-seven thousand, two hundred fifty-two".