21350013545444 has 72 divisors (see below), whose sum is σ = 41158621497000. Its totient is φ = 9676890574848.

The previous prime is 21350013545401. The next prime is 21350013545489. The reversal of 21350013545444 is 44454531005312.

It can be written as a sum of positive squares in 12 ways, for example, as 299241820900 + 21050771724544 = 547030^2 + 4588112^2 .

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, 12932762 + ... + 14489870.

Almost surely, 2^{21350013545444} is an apocalyptic number.

It is an amenable number.

21350013545444 is a deficient number, since it is larger than the sum of its proper divisors (19808607951556).

21350013545444 is a wasteful number, since it uses less digits than its factorization.

21350013545444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1557585 (or 1557566 counting only the distinct ones).

The product of its (nonzero) digits is 576000, while the sum is 41.

The spelling of 21350013545444 in words is "twenty-one trillion, three hundred fifty billion, thirteen million, five hundred forty-five thousand, four hundred forty-four".