21001774045 has 16 divisors (see below), whose sum is σ = 29795621760. Its totient is φ = 13904622144.

The previous prime is 21001774019. The next prime is 21001774061. The reversal of 21001774045 is 54047710012.

It is not a de Polignac number, because 21001774045 - 2³¹ = 18854290397 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21001773998 and 21001774016.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10344687 + ... + 10346716.

It is an arithmetic number, because the mean of its divisors is an integer number (1862226360).

Almost surely, 2^21001774045 is an apocalyptic number.

It is an amenable number.

21001774045 is a deficient number, since it is larger than the sum of its proper divisors (8793847715).

21001774045 is a wasteful number, since it uses less digits than its factorization.

21001774045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20691444.

The product of its (nonzero) digits is 7840, while the sum is 31.

The spelling of 21001774045 in words is "twenty-one billion, one million, seven hundred seventy-four thousand, forty-five".