21070700220 has 48 divisors (see below), whose sum is σ = 59036211360. Its totient is φ = 5615210496.

The previous prime is 21070700219. The next prime is 21070700239. The reversal of 21070700220 is 2200707012.

It is a super-2 number, since 2×21070700220² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19885 + ... + 206244.

It is an arithmetic number, because the mean of its divisors is an integer number (1229921070).

Almost surely, 2^21070700220 is an apocalyptic number.

21070700220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21070700220 is an abundant number, since it is smaller than the sum of its proper divisors (37965511140).

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

21070700220 is a wasteful number, since it uses less digits than its factorization.

21070700220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227694 (or 227692 counting only the distinct ones).

The product of its (nonzero) digits is 392, while the sum is 21.

The spelling of 21070700220 in words is "twenty-one billion, seventy million, seven hundred thousand, two hundred twenty".