21122231421 has 8 divisors (see below), whose sum is σ = 28270059840. Its totient is φ = 14027945312.

The previous prime is 21122231363. The next prime is 21122231423. The reversal of 21122231421 is 12413222112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21122231421 - 2⁶ = 21122231357 is a prime.

It is a super-2 number, since 2×21122231421² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122231423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13384656 + ... + 13386233.

It is an arithmetic number, because the mean of its divisors is an integer number (3533757480).

Almost surely, 2^21122231421 is an apocalyptic number.

It is an amenable number.

21122231421 is a deficient number, since it is larger than the sum of its proper divisors (7147828419).

21122231421 is a wasteful number, since it uses less digits than its factorization.

21122231421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26771155.

The product of its digits is 384, while the sum is 21.

Adding to 21122231421 its reverse (12413222112), we get a palindrome (33535453533).

The spelling of 21122231421 in words is "twenty-one billion, one hundred twenty-two million, two hundred thirty-one thousand, four hundred twenty-one".