21140421014221 has 4 divisors (see below), whose sum is σ = 21438173422944. Its totient is φ = 20842668605500.

The previous prime is 21140421014213. The next prime is 21140421014231. The reversal of 21140421014221 is 12241012404112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21140421014221 - 2³ = 21140421014213 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 (21140421014231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148876204255 + ... + 148876204396.

It is an arithmetic number, because the mean of its divisors is an integer number (5359543355736).

Almost surely, 2^{21140421014221} is an apocalyptic number.

It is an amenable number.

21140421014221 is a deficient number, since it is larger than the sum of its proper divisors (297752408723).

21140421014221 is an equidigital number, since it uses as much as digits as its factorization.

21140421014221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297752408722.

The product of its (nonzero) digits is 1024, while the sum is 25.

Adding to 21140421014221 its reverse (12241012404112), we get a palindrome (33381433418333).

The spelling of 21140421014221 in words is "twenty-one trillion, one hundred forty billion, four hundred twenty-one million, fourteen thousand, two hundred twenty-one".