21024220352 has 14 divisors (see below), whose sum is σ = 41719937388. Its totient is φ = 10512110144.

The previous prime is 21024220337. The next prime is 21024220381. The reversal of 21024220352 is 25302242012.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164251658 + ... + 164251785.

Almost surely, 2^21024220352 is an apocalyptic number.

It is an amenable number.

21024220352 is a deficient number, since it is larger than the sum of its proper divisors (20695717036).

21024220352 is an equidigital number, since it uses as much as digits as its factorization.

21024220352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328503455 (or 328503445 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

Adding to 21024220352 its reverse (25302242012), we get a palindrome (46326462364).

The spelling of 21024220352 in words is "twenty-one billion, twenty-four million, two hundred twenty thousand, three hundred fifty-two".