21989093936474 has 64 divisors (see below), whose sum is σ = 38962885109760. Its totient is φ = 9107883682560.

The previous prime is 21989093936461. The next prime is 21989093936489. The reversal of 21989093936474 is 47463939098912.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1081438412 + ... + 1081458744.

It is an arithmetic number, because the mean of its divisors is an integer number (608795079840).

Almost surely, 2^{21989093936474} is an apocalyptic number.

21989093936474 is a deficient number, since it is larger than the sum of its proper divisors (16973791173286).

21989093936474 is a wasteful number, since it uses less digits than its factorization.

21989093936474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23535.

The product of its (nonzero) digits is 634894848, while the sum is 74.

The spelling of 21989093936474 in words is "twenty-one trillion, nine hundred eighty-nine billion, ninety-three million, nine hundred thirty-six thousand, four hundred seventy-four".