21145122024 has 32 divisors (see below), whose sum is σ = 56929175520. Its totient is φ = 6506191296.

The previous prime is 21145122017. The next prime is 21145122029. The reversal of 21145122024 is 42022154112.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a junction number, because it is equal to n+sod(n) for n = 21145121985 and 21145122003.

It is not an unprimeable number, because it can be changed into a prime (21145122029) 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, 33886102 + ... + 33886725.

It is an arithmetic number, because the mean of its divisors is an integer number (1779036735).

Almost surely, 2^21145122024 is an apocalyptic number.

21145122024 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21145122024 is an abundant number, since it is smaller than the sum of its proper divisors (35784053496).

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

21145122024 is a wasteful number, since it uses less digits than its factorization.

21145122024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67772849 (or 67772845 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 24.

Adding to 21145122024 its reverse (42022154112), we get a palindrome (63167276136).

The spelling of 21145122024 in words is "twenty-one billion, one hundred forty-five million, one hundred twenty-two thousand, twenty-four".