21102430 has 16 divisors (see below), whose sum is σ = 39294720. Its totient is φ = 8149792.

The previous prime is 21102421. The next prime is 21102439. The reversal of 21102430 is 3420112.

It is an interprime number because it is at equal distance from previous prime (21102421) and next prime (21102439).

It is a self number, because there is not a number n which added to its sum of digits gives 21102430.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102439) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36094 + ... + 36673.

It is an arithmetic number, because the mean of its divisors is an integer number (2455920).

Almost surely, 2^21102430 is an apocalyptic number.

21102430 is a deficient number, since it is larger than the sum of its proper divisors (18192290).

21102430 is a wasteful number, since it uses less digits than its factorization.

21102430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72803.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 21102430 is about 4593.7381292364. The cubic root of 21102430 is about 276.3402563337.

Adding to 21102430 its reverse (3420112), we get a palindrome (24522542).

The spelling of 21102430 in words is "twenty-one million, one hundred two thousand, four hundred thirty".