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21321974636 = 225330493659
BaseRepresentation
bin10011110110111000…
…111000001101101100
32001000222001112112022
4103312320320031230
5322131411142021
613443431525312
71353243536234
oct236670701554
961028045468
1021321974636
119051776146
124170829838
13201a537a51
141063ac6cc4
1584bd4c1ab
hex4f6e3836c

21321974636 has 6 divisors (see below), whose sum is σ = 37313455620. Its totient is φ = 10660987316.

The previous prime is 21321974593. The next prime is 21321974647. The reversal of 21321974636 is 63647912312.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2665246826 + ... + 2665246833.

It is an arithmetic number, because the mean of its divisors is an integer number (6218909270).

Almost surely, 221321974636 is an apocalyptic number.

It is an amenable number.

21321974636 is a deficient number, since it is larger than the sum of its proper divisors (15991480984).

21321974636 is a wasteful number, since it uses less digits than its factorization.

21321974636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5330493663 (or 5330493661 counting only the distinct ones).

The product of its digits is 326592, while the sum is 44.

The spelling of 21321974636 in words is "twenty-one billion, three hundred twenty-one million, nine hundred seventy-four thousand, six hundred thirty-six".

Divisors: 1 2 4 5330493659 10660987318 21321974636