21512423152304 has 40 divisors (see below), whose sum is σ = 47635233649920. Its totient is φ = 9219497203008.

The previous prime is 21512423152279. The next prime is 21512423152309. The reversal of 21512423152304 is 40325132421512.

It is not an unprimeable number, because it can be changed into a prime (21512423152309) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8372477 + ... + 10635939.

It is an arithmetic number, because the mean of its divisors is an integer number (1190880841248).

Almost surely, 2^{21512423152304} is an apocalyptic number.

It is an amenable number.

21512423152304 is an abundant number, since it is smaller than the sum of its proper divisors (26122810497616).

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

21512423152304 is a wasteful number, since it uses less digits than its factorization.

21512423152304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2348337 (or 2348331 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 35.

Adding to 21512423152304 its reverse (40325132421512), we get a palindrome (61837555573816).

The spelling of 21512423152304 in words is "twenty-one trillion, five hundred twelve billion, four hundred twenty-three million, one hundred fifty-two thousand, three hundred four".