21430762 has 16 divisors (see below), whose sum is σ = 32963112. Its totient is φ = 10445760.

The previous prime is 21430757. The next prime is 21430769. The reversal of 21430762 is 26703412.

It can be written as a sum of positive squares in 4 ways, for example, as 8173881 + 13256881 = 2859^2 + 3641^2 .

It is not an unprimeable number, because it can be changed into a prime (21430769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18628 + ... + 19744.

Almost surely, 2^21430762 is an apocalyptic number.

21430762 is a deficient number, since it is larger than the sum of its proper divisors (11532350).

21430762 is a wasteful number, since it uses less digits than its factorization.

21430762 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1353.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 21430762 is about 4629.3371015730. The cubic root of 21430762 is about 277.7660765323.

It can be divided in two parts, 214307 and 62, that added together give a square (214369 = 463²).

The spelling of 21430762 in words is "twenty-one million, four hundred thirty thousand, seven hundred sixty-two".