21572628546 has 16 divisors (see below), whose sum is σ = 49308865344. Its totient is φ = 6163608144.

The previous prime is 21572628479. The next prime is 21572628551. The reversal of 21572628546 is 64582627512.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21572628495 and 21572628504.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 256816965 + ... + 256817048.

It is an arithmetic number, because the mean of its divisors is an integer number (3081804084).

Almost surely, 2^21572628546 is an apocalyptic number.

21572628546 is an abundant number, since it is smaller than the sum of its proper divisors (27736236798).

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

21572628546 is a wasteful number, since it uses less digits than its factorization.

21572628546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513634025.

The product of its digits is 1612800, while the sum is 48.

The spelling of 21572628546 in words is "twenty-one billion, five hundred seventy-two million, six hundred twenty-eight thousand, five hundred forty-six".