21661602305354 has 32 divisors (see below), whose sum is σ = 36384051128832. Its totient is φ = 9588881160000.

The previous prime is 21661602305303. The next prime is 21661602305383. The reversal of 21661602305354 is 45350320616612.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79771802 + ... + 80042885.

It is an arithmetic number, because the mean of its divisors is an integer number (1137001597776).

Almost surely, 2^{21661602305354} is an apocalyptic number.

21661602305354 is a deficient number, since it is larger than the sum of its proper divisors (14722448823478).

21661602305354 is a wasteful number, since it uses less digits than its factorization.

21661602305354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159814862.

The product of its (nonzero) digits is 777600, while the sum is 44.

The spelling of 21661602305354 in words is "twenty-one trillion, six hundred sixty-one billion, six hundred two million, three hundred five thousand, three hundred fifty-four".