21507470073761 has 48 divisors (see below), whose sum is σ = 25454114066304. Its totient is φ = 18116877332736.

The previous prime is 21507470073731. The next prime is 21507470073811. The reversal of 21507470073761 is 16737007470512.

It is not a de Polignac number, because 21507470073761 - 2¹⁸ = 21507469811617 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21507470073731) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 619919531 + ... + 619954223.

It is an arithmetic number, because the mean of its divisors is an integer number (530294043048).

Almost surely, 2^{21507470073761} is an apocalyptic number.

It is an amenable number.

21507470073761 is a deficient number, since it is larger than the sum of its proper divisors (3946643992543).

21507470073761 is a wasteful number, since it uses less digits than its factorization.

21507470073761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35590 (or 35583 counting only the distinct ones).

The product of its (nonzero) digits is 1728720, while the sum is 50.

The spelling of 21507470073761 in words is "twenty-one trillion, five hundred seven billion, four hundred seventy million, seventy-three thousand, seven hundred sixty-one".