21420792 has 48 divisors (see below), whose sum is σ = 60021000. Its totient is φ = 6893376.

The previous prime is 21420761. The next prime is 21420793. The reversal of 21420792 is 29702412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21420793) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3042 + ... + 7217.

Almost surely, 2^21420792 is an apocalyptic number.

It is an amenable number.

21420792 is an abundant number, since it is smaller than the sum of its proper divisors (38600208).

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

21420792 is a wasteful number, since it uses less digits than its factorization.

21420792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10300 (or 10293 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 21420792 is about 4628.2601482631. The cubic root of 21420792 is about 277.7229958221.

The spelling of 21420792 in words is "twenty-one million, four hundred twenty thousand, seven hundred ninety-two".