21152430124 has 48 divisors (see below), whose sum is σ = 44742718720. Its totient is φ = 8547456960.

The previous prime is 21152430113. The next prime is 21152430127. The reversal of 21152430124 is 42103425112.

It is not an unprimeable number, because it can be changed into a prime (21152430127) 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, 18034 + ... + 206470.

Almost surely, 2^21152430124 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21152430124, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22371359360).

21152430124 is an abundant number, since it is smaller than the sum of its proper divisors (23590288596).

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

21152430124 is a wasteful number, since it uses less digits than its factorization.

21152430124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188678 (or 188676 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 21152430124 its reverse (42103425112), we get a palindrome (63255855236).

The spelling of 21152430124 in words is "twenty-one billion, one hundred fifty-two million, four hundred thirty thousand, one hundred twenty-four".