21458821370 has 48 divisors (see below), whose sum is σ = 47575230120. Its totient is φ = 6924524544.

The previous prime is 21458821343. The next prime is 21458821409. The reversal of 21458821370 is 7312885412.

It can be written as a sum of positive squares in 4 ways, for example, as 21348424321 + 110397049 = 146111^2 + 10507^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1279715 + ... + 1296374.

Almost surely, 2^21458821370 is an apocalyptic number.

21458821370 is an abundant number, since it is smaller than the sum of its proper divisors (26116408750).

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

21458821370 is a wasteful number, since it uses less digits than its factorization.

21458821370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2576127 (or 2576120 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 41.

The spelling of 21458821370 in words is "twenty-one billion, four hundred fifty-eight million, eight hundred twenty-one thousand, three hundred seventy".