21552303450 has 48 divisors (see below), whose sum is σ = 54325960416. Its totient is φ = 5653060800.

The previous prime is 21552303449. The next prime is 21552303467. The reversal of 21552303450 is 5430325512.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1168572 + ... + 1186871.

It is an arithmetic number, because the mean of its divisors is an integer number (1131790842).

Almost surely, 2^21552303450 is an apocalyptic number.

21552303450 is an abundant number, since it is smaller than the sum of its proper divisors (32773656966).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21552303450 is a wasteful number, since it uses less digits than its factorization.

21552303450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2355519 (or 2355514 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 30.

Adding to 21552303450 its reverse (5430325512), we get a palindrome (26982628962).

The spelling of 21552303450 in words is "twenty-one billion, five hundred fifty-two million, three hundred three thousand, four hundred fifty".