21400092 has 48 divisors (see below), whose sum is σ = 63409920. Its totient is φ = 6114096.

The previous prime is 21400091. The next prime is 21400103. The reversal of 21400092 is 29000412.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21400091) 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, 13398 + ... + 14909.

It is an arithmetic number, because the mean of its divisors is an integer number (1321040).

Almost surely, 2^21400092 is an apocalyptic number.

It is an amenable number.

21400092 is an abundant number, since it is smaller than the sum of its proper divisors (42009828).

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

21400092 is a wasteful number, since it uses less digits than its factorization.

21400092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28327 (or 28319 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 21400092 is about 4626.0233462446. The cubic root of 21400092 is about 277.6335077083.

The spelling of 21400092 in words is "twenty-one million, four hundred thousand, ninety-two".