21455453131 has 16 divisors (see below), whose sum is σ = 24585039360. Its totient is φ = 18342060480.

The previous prime is 21455453113. The next prime is 21455453137. The reversal of 21455453131 is 13135455412.

It is a cyclic number.

It is not a de Polignac number, because 21455453131 - 2²³ = 21447064523 is a prime.

It is a super-2 number, since 2×21455453131² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21455453137) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7912866 + ... + 7915576.

It is an arithmetic number, because the mean of its divisors is an integer number (1536564960).

Almost surely, 2^21455453131 is an apocalyptic number.

21455453131 is a deficient number, since it is larger than the sum of its proper divisors (3129586229).

21455453131 is a wasteful number, since it uses less digits than its factorization.

21455453131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5274.

The product of its digits is 36000, while the sum is 34.

The spelling of 21455453131 in words is "twenty-one billion, four hundred fifty-five million, four hundred fifty-three thousand, one hundred thirty-one".