21112621421 has 8 divisors (see below), whose sum is σ = 21322414464. Its totient is φ = 20902921200.

The previous prime is 21112621363. The next prime is 21112621447. The reversal of 21112621421 is 12412621112.

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 21112621421 - 2¹⁴ = 21112605037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112626421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 489896 + ... + 531246.

It is an arithmetic number, because the mean of its divisors is an integer number (2665301808).

Almost surely, 2^21112621421 is an apocalyptic number.

It is an amenable number.

21112621421 is a deficient number, since it is larger than the sum of its proper divisors (209793043).

21112621421 is a wasteful number, since it uses less digits than its factorization.

21112621421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46411.

The product of its digits is 384, while the sum is 23.

The spelling of 21112621421 in words is "twenty-one billion, one hundred twelve million, six hundred twenty-one thousand, four hundred twenty-one".