21045454431454 has 16 divisors (see below), whose sum is σ = 31707898224768. Its totient is φ = 10476156923352.

The previous prime is 21045454431431. The next prime is 21045454431487. The reversal of 21045454431454 is 45413445454012.

It is a super-2 number, since 2×21045454431454² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22980457 + ... + 23878699.

It is an arithmetic number, because the mean of its divisors is an integer number (1981743639048).

Almost surely, 2^{21045454431454} is an apocalyptic number.

21045454431454 is a deficient number, since it is larger than the sum of its proper divisors (10662443793314).

21045454431454 is a wasteful number, since it uses less digits than its factorization.

21045454431454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 950079.

The product of its (nonzero) digits is 3072000, while the sum is 46.

Adding to 21045454431454 its reverse (45413445454012), we get a palindrome (66458899885466).

The spelling of 21045454431454 in words is "twenty-one trillion, forty-five billion, four hundred fifty-four million, four hundred thirty-one thousand, four hundred fifty-four".