21398160 has 160 divisors (see below), whose sum is σ = 77709312. Its totient is φ = 4769280.

The previous prime is 21398141. The next prime is 21398171. The reversal of 21398160 is 6189312.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 78825 + ... + 79095.

Almost surely, 2^21398160 is an apocalyptic number.

21398160 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 21398160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38854656).

21398160 is an abundant number, since it is smaller than the sum of its proper divisors (56311152).

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

21398160 is a wasteful number, since it uses less digits than its factorization.

21398160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341 (or 335 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 21398160 is about 4625.8145228705. The cubic root of 21398160 is about 277.6251525405.

The spelling of 21398160 in words is "twenty-one million, three hundred ninety-eight thousand, one hundred sixty".