21421496 has 32 divisors (see below), whose sum is σ = 43908480. Its totient is φ = 9753600.

The previous prime is 21421489. The next prime is 21421537. The reversal of 21421496 is 69412412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1676 + ... + 6756.

It is an arithmetic number, because the mean of its divisors is an integer number (1372140).

Almost surely, 2^21421496 is an apocalyptic number.

It is an amenable number.

21421496 is an abundant number, since it is smaller than the sum of its proper divisors (22486984).

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

21421496 is a wasteful number, since it uses less digits than its factorization.

21421496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5135 (or 5131 counting only the distinct ones).

The product of its digits is 3456, while the sum is 29.

The square root of 21421496 is about 4628.3362021357. The cubic root of 21421496 is about 277.7260382687.

The spelling of 21421496 in words is "twenty-one million, four hundred twenty-one thousand, four hundred ninety-six".