21023454152 has 32 divisors (see below), whose sum is σ = 41186335680. Its totient is φ = 10041620160.

The previous prime is 21023454139. The next prime is 21023454157. The reversal of 21023454152 is 25145432012.

It is not an unprimeable number, because it can be changed into a prime (21023454157) 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, 68327 + ... + 216137.

It is an arithmetic number, because the mean of its divisors is an integer number (1287072990).

Almost surely, 2^21023454152 is an apocalyptic number.

It is an amenable number.

21023454152 is a deficient number, since it is larger than the sum of its proper divisors (20162881528).

21023454152 is a wasteful number, since it uses less digits than its factorization.

21023454152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148613 (or 148609 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 29.

Adding to 21023454152 its reverse (25145432012), we get a palindrome (46168886164).

The spelling of 21023454152 in words is "twenty-one billion, twenty-three million, four hundred fifty-four thousand, one hundred fifty-two".