21423101421 has 8 divisors (see below), whose sum is σ = 28925706880. Its totient is φ = 14101281792.

The previous prime is 21423101383. The next prime is 21423101431. The reversal of 21423101421 is 12410132412.

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

It is not a de Polignac number, because 21423101421 - 2¹⁴ = 21423085037 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 (21423101431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45196180 + ... + 45196653.

It is an arithmetic number, because the mean of its divisors is an integer number (3615713360).

Almost surely, 2^21423101421 is an apocalyptic number.

It is an amenable number.

21423101421 is a deficient number, since it is larger than the sum of its proper divisors (7502605459).

21423101421 is an equidigital number, since it uses as much as digits as its factorization.

21423101421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90392915.

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

Adding to 21423101421 its reverse (12410132412), we get a palindrome (33833233833).

The spelling of 21423101421 in words is "twenty-one billion, four hundred twenty-three million, one hundred one thousand, four hundred twenty-one".