21470407137 has 6 divisors (see below), whose sum is σ = 31012810322. Its totient is φ = 14313604752.

The previous prime is 21470407121. The next prime is 21470407157. The reversal of 21470407137 is 73170407412.

21470407137 is a `hidden beast` number, since 214 + 7 + 0 + 407 + 1 + 37 = 666.

It can be written as a sum of positive squares in only one way, i.e., 14679987921 + 6790419216 = 121161^2 + 82404^2 .

It is not a de Polignac number, because 21470407137 - 2⁴ = 21470407121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21470407117) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1192800388 + ... + 1192800405.

Almost surely, 2^21470407137 is an apocalyptic number.

It is an amenable number.

21470407137 is a deficient number, since it is larger than the sum of its proper divisors (9542403185).

21470407137 is a wasteful number, since it uses less digits than its factorization.

21470407137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2385600799 (or 2385600796 counting only the distinct ones).

The product of its (nonzero) digits is 32928, while the sum is 36.

The spelling of 21470407137 in words is "twenty-one billion, four hundred seventy million, four hundred seven thousand, one hundred thirty-seven".