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21640120589 is a prime number
BaseRepresentation
bin10100001001110110…
…100000100100001101
32001212010201000201202
4110021312200210031
5323304332324324
613535154515245
71364155663403
oct241166404415
961763630652
1021640120589
1191a531398a
12423b295b25
13206b41a0a9
141094061473
15869c428ae
hex509da090d

21640120589 has 2 divisors, whose sum is σ = 21640120590. Its totient is φ = 21640120588.

The previous prime is 21640120577. The next prime is 21640120597. The reversal of 21640120589 is 98502104612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19644264964 + 1995855625 = 140158^2 + 44675^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-21640120589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21640120289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10820060294 + 10820060295.

It is an arithmetic number, because the mean of its divisors is an integer number (10820060295).

Almost surely, 221640120589 is an apocalyptic number.

It is an amenable number.

21640120589 is a deficient number, since it is larger than the sum of its proper divisors (1).

21640120589 is an equidigital number, since it uses as much as digits as its factorization.

21640120589 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 38.

The spelling of 21640120589 in words is "twenty-one billion, six hundred forty million, one hundred twenty thousand, five hundred eighty-nine".