21641244766570 has 256 divisors, whose sum is σ = 47548636692480. Its totient is φ = 6986565964800.

The previous prime is 21641244766567. The next prime is 21641244766597. The reversal of 21641244766570 is 7566744214612.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 6473598319 + ... + 6473601661.

It is an arithmetic number, because the mean of its divisors is an integer number (185736862080).

Almost surely, 2^{21641244766570} is an apocalyptic number.

21641244766570 is an abundant number, since it is smaller than the sum of its proper divisors (25907391925910).

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

21641244766570 is a wasteful number, since it uses less digits than its factorization.

21641244766570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5061.

The product of its (nonzero) digits is 13547520, while the sum is 55.

The spelling of 21641244766570 in words is "twenty-one trillion, six hundred forty-one billion, two hundred forty-four million, seven hundred sixty-six thousand, five hundred seventy".