21232430746 has 16 divisors (see below), whose sum is σ = 32012215848. Its totient is φ = 10561824000.

The previous prime is 21232430729. The next prime is 21232430761. The reversal of 21232430746 is 64703423212.

It can be written as a sum of positive squares in 4 ways, for example, as 13166415025 + 8066015721 = 114745^2 + 89811^2 .

It is a super-2 number, since 2×21232430746² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 293596 + ... + 358696.

Almost surely, 2^21232430746 is an apocalyptic number.

21232430746 is a deficient number, since it is larger than the sum of its proper divisors (10779785102).

21232430746 is a wasteful number, since it uses less digits than its factorization.

21232430746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65937.

The product of its (nonzero) digits is 48384, while the sum is 34.

Adding to 21232430746 its reverse (64703423212), we get a palindrome (85935853958).

The spelling of 21232430746 in words is "twenty-one billion, two hundred thirty-two million, four hundred thirty thousand, seven hundred forty-six".