21145454000 has 80 divisors (see below), whose sum is σ = 55777921056. Its totient is φ = 7689248000.

The previous prime is 21145453991. The next prime is 21145454059. The reversal of 21145454000 is 45454112.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×21145454000² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 458579 + ... + 502578.

Almost surely, 2^21145454000 is an apocalyptic number.

21145454000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21145454000 is an abundant number, since it is smaller than the sum of its proper divisors (34632467056).

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

21145454000 is a wasteful number, since it uses less digits than its factorization.

21145454000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 961191 (or 961175 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 26.

The spelling of 21145454000 in words is "twenty-one billion, one hundred forty-five million, four hundred fifty-four thousand".