21035513220 has 96 divisors (see below), whose sum is σ = 59353620480. Its totient is φ = 5566389120.

The previous prime is 21035513203. The next prime is 21035513231. The reversal of 21035513220 is 2231553012.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4273921 + ... + 4278839.

It is an arithmetic number, because the mean of its divisors is an integer number (618266880).

Almost surely, 2^21035513220 is an apocalyptic number.

21035513220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21035513220 is an abundant number, since it is smaller than the sum of its proper divisors (38318107260).

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

21035513220 is a wasteful number, since it uses less digits than its factorization.

21035513220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5465 (or 5463 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

The spelling of 21035513220 in words is "twenty-one billion, thirty-five million, five hundred thirteen thousand, two hundred twenty".