21430076 has 6 divisors (see below), whose sum is σ = 37502640. Its totient is φ = 10715036.

The previous prime is 21430069. The next prime is 21430091. The reversal of 21430076 is 67003412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2678756 + ... + 2678763.

It is an arithmetic number, because the mean of its divisors is an integer number (6250440).

Almost surely, 2^21430076 is an apocalyptic number.

It is an amenable number.

21430076 is a deficient number, since it is larger than the sum of its proper divisors (16072564).

21430076 is a wasteful number, since it uses less digits than its factorization.

21430076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5357523 (or 5357521 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 21430076 is about 4629.2630082984. The cubic root of 21430076 is about 277.7631127310.

Adding to 21430076 its reverse (67003412), we get a palindrome (88433488).

The spelling of 21430076 in words is "twenty-one million, four hundred thirty thousand, seventy-six".