21067207220 has 48 divisors (see below), whose sum is σ = 46612540800. Its totient is φ = 7976004480.

The previous prime is 21067207171. The next prime is 21067207247. The reversal of 21067207220 is 2270276012.

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, 396425 + ... + 446415.

It is an arithmetic number, because the mean of its divisors is an integer number (971094600).

Almost surely, 2^21067207220 is an apocalyptic number.

21067207220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21067207220 is an abundant number, since it is smaller than the sum of its proper divisors (25545333580).

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

21067207220 is a wasteful number, since it uses less digits than its factorization.

21067207220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51128 (or 51126 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 29.

The spelling of 21067207220 in words is "twenty-one billion, sixty-seven million, two hundred seven thousand, two hundred twenty".