21153243030 has 32 divisors (see below), whose sum is σ = 51410419200. Its totient is φ = 5569460832.

The previous prime is 21153242993. The next prime is 21153243031. The reversal of 21153243030 is 3034235112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21153243031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4460340 + ... + 4465079.

It is an arithmetic number, because the mean of its divisors is an integer number (1606575600).

Almost surely, 2^21153243030 is an apocalyptic number.

21153243030 is an abundant number, since it is smaller than the sum of its proper divisors (30257176170).

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

21153243030 is a wasteful number, since it uses less digits than its factorization.

21153243030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8925508.

The product of its (nonzero) digits is 2160, while the sum is 24.

Adding to 21153243030 its reverse (3034235112), we get a palindrome (24187478142).

The spelling of 21153243030 in words is "twenty-one billion, one hundred fifty-three million, two hundred forty-three thousand, thirty".