21430332052 has 6 divisors (see below), whose sum is σ = 37503081098. Its totient is φ = 10715166024.

The previous prime is 21430331999. The next prime is 21430332061. The reversal of 21430332052 is 25023303412.

It can be written as a sum of positive squares in only one way, i.e., 11697720336 + 9732611716 = 108156^2 + 98654^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2678791503 + ... + 2678791510.

Almost surely, 2^21430332052 is an apocalyptic number.

It is an amenable number.

21430332052 is a deficient number, since it is larger than the sum of its proper divisors (16072749046).

21430332052 is a wasteful number, since it uses less digits than its factorization.

21430332052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5357583017 (or 5357583015 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 25.

Adding to 21430332052 its reverse (25023303412), we get a palindrome (46453635464).

The spelling of 21430332052 in words is "twenty-one billion, four hundred thirty million, three hundred thirty-two thousand, fifty-two".