21221524541064 has 64 divisors (see below), whose sum is σ = 53091017136000. Its totient is φ = 7068882237440.

The previous prime is 21221524541023. The next prime is 21221524541069. The reversal of 21221524541064 is 46014542512212.

It is not an unprimeable number, because it can be changed into a prime (21221524541069) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 245664472 + ... + 245750840.

It is an arithmetic number, because the mean of its divisors is an integer number (829547142750).

Almost surely, 2^{21221524541064} is an apocalyptic number.

21221524541064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21221524541064 is an abundant number, since it is smaller than the sum of its proper divisors (31869492594936).

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

21221524541064 is a wasteful number, since it uses less digits than its factorization.

21221524541064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93438 (or 93434 counting only the distinct ones).

The product of its (nonzero) digits is 153600, while the sum is 39.

The spelling of 21221524541064 in words is "twenty-one trillion, two hundred twenty-one billion, five hundred twenty-four million, five hundred forty-one thousand, sixty-four".