21267216372020 has 48 divisors (see below), whose sum is σ = 44717224946688. Its totient is φ = 8496211704960.

The previous prime is 21267216371969. The next prime is 21267216372041. The reversal of 21267216372020 is 2027361276212.

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, 65296694 + ... + 65621586.

It is an arithmetic number, because the mean of its divisors is an integer number (931608853056).

Almost surely, 2^{21267216372020} is an apocalyptic number.

21267216372020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21267216372020 is an abundant number, since it is smaller than the sum of its proper divisors (23450008574668).

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

21267216372020 is a wasteful number, since it uses less digits than its factorization.

21267216372020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329000 (or 328998 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 41.

The spelling of 21267216372020 in words is "twenty-one trillion, two hundred sixty-seven billion, two hundred sixteen million, three hundred seventy-two thousand, twenty".