212424421421 has 16 divisors (see below), whose sum is σ = 227077032960. Its totient is φ = 198274258560.

The previous prime is 212424421397. The next prime is 212424421477. The reversal of 212424421421 is 124124424212.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212424421421 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212424481421) 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, 732776 + ... + 980718.

It is an arithmetic number, because the mean of its divisors is an integer number (14192314560).

Almost surely, 2^212424421421 is an apocalyptic number.

It is an amenable number.

212424421421 is a deficient number, since it is larger than the sum of its proper divisors (14652611539).

212424421421 is a wasteful number, since it uses less digits than its factorization.

212424421421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248956.

The product of its digits is 8192, while the sum is 29.

Adding to 212424421421 its reverse (124124424212), we get a palindrome (336548845633).

The spelling of 212424421421 in words is "two hundred twelve billion, four hundred twenty-four million, four hundred twenty-one thousand, four hundred twenty-one".