21126502737 has 12 divisors (see below), whose sum is σ = 30517786624. Its totient is φ = 14083538040.

The previous prime is 21126502711. The next prime is 21126502739. The reversal of 21126502737 is 73720562112.

21126502737 is a `hidden beast` number, since 2 + 112 + 6 + 502 + 7 + 37 = 666.

It is not a de Polignac number, because 21126502737 - 2¹⁶ = 21126437201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21126502739) by changing a digit.

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 in 11 ways as a sum of consecutive naturals, for example, 132912 + ... + 244782.

Almost surely, 2^21126502737 is an apocalyptic number.

It is an amenable number.

21126502737 is a deficient number, since it is larger than the sum of its proper divisors (9391283887).

21126502737 is a wasteful number, since it uses less digits than its factorization.

21126502737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132860 (or 132857 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The spelling of 21126502737 in words is "twenty-one billion, one hundred twenty-six million, five hundred two thousand, seven hundred thirty-seven".