21430233044 has 18 divisors (see below), whose sum is σ = 41222205402. Its totient is φ = 9741014800.

The previous prime is 21430233029. The next prime is 21430233053. The reversal of 21430233044 is 44033203412.

It can be written as a sum of positive squares in only one way, i.e., 19149024400 + 2281208644 = 138380^2 + 47762^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22138187 + ... + 22139154.

Almost surely, 2^21430233044 is an apocalyptic number.

It is an amenable number.

21430233044 is a deficient number, since it is larger than the sum of its proper divisors (19791972358).

21430233044 is a wasteful number, since it uses less digits than its factorization.

21430233044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44277367 (or 44277354 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 26.

Adding to 21430233044 its reverse (44033203412), we get a palindrome (65463436456).

The spelling of 21430233044 in words is "twenty-one billion, four hundred thirty million, two hundred thirty-three thousand, forty-four".