21406141421 has 36 divisors (see below), whose sum is σ = 25810056000. Its totient is φ = 17701210800.

The previous prime is 21406141391. The next prime is 21406141429. The reversal of 21406141421 is 12414160412.

It is not a de Polignac number, because 21406141421 - 2¹⁸ = 21405879277 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 (21406141429) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 23496956 + ... + 23497866.

It is an arithmetic number, because the mean of its divisors is an integer number (716946000).

Almost surely, 2^21406141421 is an apocalyptic number.

It is an amenable number.

21406141421 is a deficient number, since it is larger than the sum of its proper divisors (4403914579).

21406141421 is an equidigital number, since it uses as much as digits as its factorization.

21406141421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1486 (or 1448 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The spelling of 21406141421 in words is "twenty-one billion, four hundred six million, one hundred forty-one thousand, four hundred twenty-one".