21122430 has 48 divisors (see below), whose sum is σ = 58974480. Its totient is φ = 4827648.

The previous prime is 21122419. The next prime is 21122443. The reversal of 21122430 is 3422112.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5715 + ... + 8654.

It is an arithmetic number, because the mean of its divisors is an integer number (1228635).

Almost surely, 2^21122430 is an apocalyptic number.

21122430 is an abundant number, since it is smaller than the sum of its proper divisors (37852050).

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

21122430 is a wasteful number, since it uses less digits than its factorization.

21122430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14393 (or 14386 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 21122430 is about 4595.9144900662. The cubic root of 21122430 is about 276.4275300113.

Adding to 21122430 its reverse (3422112), we get a palindrome (24544542).

The spelling of 21122430 in words is "twenty-one million, one hundred twenty-two thousand, four hundred thirty".