21103046444644 has 24 divisors (see below), whose sum is σ = 37928851035768. Its totient is φ = 10266237918720.

The previous prime is 21103046444633. The next prime is 21103046444653. The reversal of 21103046444644 is 44644464030112.

It can be written as a sum of positive squares in 4 ways, for example, as 2987934244 + 21100058510400 = 54662^2 + 4593480^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21103046444644.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14228634 + ... + 15641614.

It is an arithmetic number, because the mean of its divisors is an integer number (1580368793157).

Almost surely, 2^{21103046444644} is an apocalyptic number.

It is an amenable number.

21103046444644 is a deficient number, since it is larger than the sum of its proper divisors (16825804591124).

21103046444644 is a wasteful number, since it uses less digits than its factorization.

21103046444644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1513935 (or 1513933 counting only the distinct ones).

The product of its (nonzero) digits is 884736, while the sum is 43.

The spelling of 21103046444644 in words is "twenty-one trillion, one hundred three billion, forty-six million, four hundred forty-four thousand, six hundred forty-four".