21211230024 has 32 divisors (see below), whose sum is σ = 58920084000. Its totient is φ = 7070409936.

The previous prime is 21211230023. The next prime is 21211230091. The reversal of 21211230024 is 42003211212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21211229979 and 21211230006.

It is not an unprimeable number, because it can be changed into a prime (21211230023) 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, 49099854 + ... + 49100285.

It is an arithmetic number, because the mean of its divisors is an integer number (1841252625).

Almost surely, 2^21211230024 is an apocalyptic number.

21211230024 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21211230024 is an abundant number, since it is smaller than the sum of its proper divisors (37708853976).

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

21211230024 is a wasteful number, since it uses less digits than its factorization.

21211230024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98200154 (or 98200144 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21211230024 its reverse (42003211212), we get a palindrome (63214441236).

The spelling of 21211230024 in words is "twenty-one billion, two hundred eleven million, two hundred thirty thousand, twenty-four".