21654502004 has 12 divisors (see below), whose sum is σ = 38243043300. Its totient is φ = 10727918208.

The previous prime is 21654501983. The next prime is 21654502019. The reversal of 21654502004 is 40020545612.

It can be written as a sum of positive squares in 2 ways, for example, as 13899938404 + 7754563600 = 117898^2 + 88060^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24832709 + ... + 24833580.

It is an arithmetic number, because the mean of its divisors is an integer number (3186920275).

Almost surely, 2^21654502004 is an apocalyptic number.

It is an amenable number.

21654502004 is a deficient number, since it is larger than the sum of its proper divisors (16588541296).

21654502004 is a wasteful number, since it uses less digits than its factorization.

21654502004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49666402 (or 49666400 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 29.

The spelling of 21654502004 in words is "twenty-one billion, six hundred fifty-four million, five hundred two thousand, four".