21540046350570 has 256 divisors, whose sum is σ = 60197196625920. Its totient is φ = 4877604864000.

The previous prime is 21540046350521. The next prime is 21540046350577. The reversal of 21540046350570 is 7505364004512.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21540046350577) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1854177402 + ... + 1854189018.

It is an arithmetic number, because the mean of its divisors is an integer number (235145299320).

Almost surely, 2^{21540046350570} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21540046350570, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30098598312960).

21540046350570 is an abundant number, since it is smaller than the sum of its proper divisors (38657150275350).

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

21540046350570 is a wasteful number, since it uses less digits than its factorization.

21540046350570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15781.

The product of its (nonzero) digits is 504000, while the sum is 42.

The spelling of 21540046350570 in words is "twenty-one trillion, five hundred forty billion, forty-six million, three hundred fifty thousand, five hundred seventy".