21453115120 has 20 divisors (see below), whose sum is σ = 49878492840. Its totient is φ = 8581246016.

The previous prime is 21453115109. The next prime is 21453115127. The reversal of 21453115120 is 2151135412.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×21453115120² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21453115127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134081890 + ... + 134082049.

It is an arithmetic number, because the mean of its divisors is an integer number (2493924642).

Almost surely, 2^21453115120 is an apocalyptic number.

21453115120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21453115120 is an abundant number, since it is smaller than the sum of its proper divisors (28425377720).

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

21453115120 is a wasteful number, since it uses less digits than its factorization.

21453115120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268163952 (or 268163946 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 25.

The spelling of 21453115120 in words is "twenty-one billion, four hundred fifty-three million, one hundred fifteen thousand, one hundred twenty".