21270930 has 32 divisors (see below), whose sum is σ = 52432704. Its totient is φ = 5518656.

The previous prime is 21270919. The next prime is 21270941. The reversal of 21270930 is 3907212.

It is an interprime number because it is at equal distance from previous prime (21270919) and next prime (21270941).

It is a self number, because there is not a number n which added to its sum of digits gives 21270930.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8472 + ... + 10691.

It is an arithmetic number, because the mean of its divisors is an integer number (1638522).

Almost surely, 2^21270930 is an apocalyptic number.

21270930 is an abundant number, since it is smaller than the sum of its proper divisors (31161774).

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

21270930 is a wasteful number, since it uses less digits than its factorization.

21270930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19210.

The product of its (nonzero) digits is 756, while the sum is 24.

The square root of 21270930 is about 4612.0418471649. The cubic root of 21270930 is about 277.0738202901.

The spelling of 21270930 in words is "twenty-one million, two hundred seventy thousand, nine hundred thirty".