21202424012 has 24 divisors (see below), whose sum is σ = 46259834880. Its totient is φ = 8260684560.

The previous prime is 21202424011. The next prime is 21202424039. The reversal of 21202424012 is 21042420212.

It is a super-2 number, since 2×21202424012² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21202424011) 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, 34419212 + ... + 34419827.

It is an arithmetic number, because the mean of its divisors is an integer number (1927493120).

Almost surely, 2^21202424012 is an apocalyptic number.

21202424012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21202424012 is an abundant number, since it is smaller than the sum of its proper divisors (25057410868).

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

21202424012 is a wasteful number, since it uses less digits than its factorization.

21202424012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68839061 (or 68839059 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 21202424012 its reverse (21042420212), we get a palindrome (42244844224).

The spelling of 21202424012 in words is "twenty-one billion, two hundred two million, four hundred twenty-four thousand, twelve".