21658073137 has 2 divisors, whose sum is σ = 21658073138. Its totient is φ = 21658073136.

The previous prime is 21658073131. The next prime is 21658073147. The reversal of 21658073137 is 73137085612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20952852001 + 705221136 = 144751^2 + 26556^2 .

It is a cyclic number.

It is not a de Polignac number, because 21658073137 - 2⁷ = 21658073009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21658073093 and 21658073102.

It is not a weakly prime, because it can be changed into another prime (21658073131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10829036568 + 10829036569.

It is an arithmetic number, because the mean of its divisors is an integer number (10829036569).

Almost surely, 2^21658073137 is an apocalyptic number.

It is an amenable number.

21658073137 is a deficient number, since it is larger than the sum of its proper divisors (1).

21658073137 is an equidigital number, since it uses as much as digits as its factorization.

21658073137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 211680, while the sum is 43.

The spelling of 21658073137 in words is "twenty-one billion, six hundred fifty-eight million, seventy-three thousand, one hundred thirty-seven".