21357535074 has 8 divisors (see below), whose sum is σ = 42715070160. Its totient is φ = 7119178356.

The previous prime is 21357535061. The next prime is 21357535079. The reversal of 21357535074 is 47053575312.

It is a sphenic number, since it is the product of 3 distinct primes.

21357535074 is an admirable number.

It is a super-2 number, since 2×21357535074² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21357535079) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1779794584 + ... + 1779794595.

It is an arithmetic number, because the mean of its divisors is an integer number (5339383770).

Almost surely, 2^21357535074 is an apocalyptic number.

21357535074 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21357535074 is a wasteful number, since it uses less digits than its factorization.

21357535074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3559589184.

The product of its (nonzero) digits is 441000, while the sum is 42.

The spelling of 21357535074 in words is "twenty-one billion, three hundred fifty-seven million, five hundred thirty-five thousand, seventy-four".