21123814160 has 80 divisors (see below), whose sum is σ = 51220388352. Its totient is φ = 8092569600.

The previous prime is 21123814157. The next prime is 21123814163. The reversal of 21123814160 is 6141832112.

It is an interprime number because it is at equal distance from previous prime (21123814157) and next prime (21123814163).

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

It is not an unprimeable number, because it can be changed into a prime (21123814163) 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, 196655 + ... + 284465.

Almost surely, 2^21123814160 is an apocalyptic number.

21123814160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21123814160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25610194176).

21123814160 is an abundant number, since it is smaller than the sum of its proper divisors (30096574192).

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

21123814160 is a wasteful number, since it uses less digits than its factorization.

21123814160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87952 (or 87946 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 29.

The spelling of 21123814160 in words is "twenty-one billion, one hundred twenty-three million, eight hundred fourteen thousand, one hundred sixty".