21127503315357 has 32 divisors (see below), whose sum is σ = 32950117680000. Its totient is φ = 13342574949120.

The previous prime is 21127503315353. The next prime is 21127503315377. The reversal of 21127503315357 is 75351330572112.

21127503315357 is a `hidden beast` number, since 2 + 1 + 12 + 7 + 503 + 31 + 53 + 57 = 666.

It is not a de Polignac number, because 21127503315357 - 2² = 21127503315353 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21127503315353) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4472107 + ... + 7890167.

It is an arithmetic number, because the mean of its divisors is an integer number (1029691177500).

Almost surely, 2^{21127503315357} is an apocalyptic number.

21127503315357 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

21127503315357 is a deficient number, since it is larger than the sum of its proper divisors (11822614364643).

21127503315357 is a wasteful number, since it uses less digits than its factorization.

21127503315357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3430138 (or 3430132 counting only the distinct ones).

The product of its (nonzero) digits is 661500, while the sum is 45.

Adding to 21127503315357 its reverse (75351330572112), we get a palindrome (96478833887469).

The spelling of 21127503315357 in words is "twenty-one trillion, one hundred twenty-seven billion, five hundred three million, three hundred fifteen thousand, three hundred fifty-seven".