21043605754 has 16 divisors (see below), whose sum is σ = 33445761408. Its totient is φ = 9895891392.

The previous prime is 21043605749. The next prime is 21043605761. The reversal of 21043605754 is 45750634012.

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, 169092 + ... + 265855.

It is an arithmetic number, because the mean of its divisors is an integer number (2090360088).

Almost surely, 2^21043605754 is an apocalyptic number.

21043605754 is a deficient number, since it is larger than the sum of its proper divisors (12402155654).

21043605754 is a wasteful number, since it uses less digits than its factorization.

21043605754 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436389.

The product of its (nonzero) digits is 100800, while the sum is 37.

The spelling of 21043605754 in words is "twenty-one billion, forty-three million, six hundred five thousand, seven hundred fifty-four".