21434944 has 28 divisors (see below), whose sum is σ = 44005500. Its totient is φ = 10347008.

The previous prime is 21434939. The next prime is 21434953. The reversal of 21434944 is 44943412.

It can be written as a sum of positive squares in 2 ways, for example, as 16974400 + 4460544 = 4120^2 + 2112^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3919 + ... + 7630.

It is an arithmetic number, because the mean of its divisors is an integer number (1571625).

Almost surely, 2^21434944 is an apocalyptic number.

It is an amenable number.

21434944 is an abundant number, since it is smaller than the sum of its proper divisors (22570556).

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

21434944 is a wasteful number, since it uses less digits than its factorization.

21434944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11590 (or 11580 counting only the distinct ones).

The product of its digits is 13824, while the sum is 31.

The square root of 21434944 is about 4629.7887640798. The cubic root of 21434944 is about 277.7841431193.

The spelling of 21434944 in words is "twenty-one million, four hundred thirty-four thousand, nine hundred forty-four".