21421213123324 has 48 divisors (see below), whose sum is σ = 43920945250560. Its totient is φ = 8949751367040.

The previous prime is 21421213123273. The next prime is 21421213123327. The reversal of 21421213123324 is 42332131212412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21421213123327) 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, 5637894 + ... + 8638765.

It is an arithmetic number, because the mean of its divisors is an integer number (915019692720).

Almost surely, 2^{21421213123324} is an apocalyptic number.

It is an amenable number.

21421213123324 is an abundant number, since it is smaller than the sum of its proper divisors (22499732127236).

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

21421213123324 is a wasteful number, since it uses less digits than its factorization.

21421213123324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14278018 (or 14278016 counting only the distinct ones).

The product of its digits is 13824, while the sum is 31.

Adding to 21421213123324 its reverse (42332131212412), we get a palindrome (63753344335736).

The spelling of 21421213123324 in words is "twenty-one trillion, four hundred twenty-one billion, two hundred thirteen million, one hundred twenty-three thousand, three hundred twenty-four".