21500273706377 has 4 divisors (see below), whose sum is σ = 21669567200256. Its totient is φ = 21330980212500.

The previous prime is 21500273706367. The next prime is 21500273706391. The reversal of 21500273706377 is 77360737200512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21500273706377 - 2²⁸ = 21500005270921 is a prime.

It is a super-2 number, since 2×21500273706377² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21500273706367) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84646746749 + ... + 84646747002.

It is an arithmetic number, because the mean of its divisors is an integer number (5417391800064).

Almost surely, 2^{21500273706377} is an apocalyptic number.

It is an amenable number.

21500273706377 is a deficient number, since it is larger than the sum of its proper divisors (169293493879).

21500273706377 is a wasteful number, since it uses less digits than its factorization.

21500273706377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169293493878.

The product of its (nonzero) digits is 2593080, while the sum is 50.

The spelling of 21500273706377 in words is "twenty-one trillion, five hundred billion, two hundred seventy-three million, seven hundred six thousand, three hundred seventy-seven".