21522442620 has 48 divisors (see below), whose sum is σ = 68871817728. Its totient is φ = 4919415360.

The previous prime is 21522442609. The next prime is 21522442687. The reversal of 21522442620 is 2624422512.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25621536 + ... + 25622375.

It is an arithmetic number, because the mean of its divisors is an integer number (1434829536).

Almost surely, 2^21522442620 is an apocalyptic number.

21522442620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21522442620 is an abundant number, since it is smaller than the sum of its proper divisors (47349375108).

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

21522442620 is a wasteful number, since it uses less digits than its factorization.

21522442620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51243930 (or 51243928 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 30.

The spelling of 21522442620 in words is "twenty-one billion, five hundred twenty-two million, four hundred forty-two thousand, six hundred twenty".