21454534236 has 48 divisors (see below), whose sum is σ = 50901304608. Its totient is φ = 7031500800.

The previous prime is 21454534193. The next prime is 21454534237. The reversal of 21454534236 is 63243545412.

It is a super-2 number, since 2×21454534236² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21454534194 and 21454534203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21454534237) 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, 2749156 + ... + 2756948.

It is an arithmetic number, because the mean of its divisors is an integer number (1060443846).

Almost surely, 2^21454534236 is an apocalyptic number.

It is an amenable number.

21454534236 is an abundant number, since it is smaller than the sum of its proper divisors (29446770372).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21454534236 is a wasteful number, since it uses less digits than its factorization.

21454534236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11622 (or 11620 counting only the distinct ones).

The product of its digits is 345600, while the sum is 39.

The spelling of 21454534236 in words is "twenty-one billion, four hundred fifty-four million, five hundred thirty-four thousand, two hundred thirty-six".