21221364340421 has 8 divisors (see below), whose sum is σ = 24258739093440. Its totient is φ = 18185427406368.

The previous prime is 21221364340391. The next prime is 21221364340457. The reversal of 21221364340421 is 12404346312212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21221364340421 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 (21221364346421) 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, 359423111 + ... + 359482148.

It is an arithmetic number, because the mean of its divisors is an integer number (3032342386680).

Almost surely, 2^{21221364340421} is an apocalyptic number.

It is an amenable number.

21221364340421 is a deficient number, since it is larger than the sum of its proper divisors (3037374753019).

21221364340421 is an equidigital number, since it uses as much as digits as its factorization.

21221364340421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718909483.

The product of its (nonzero) digits is 55296, while the sum is 35.

The spelling of 21221364340421 in words is "twenty-one trillion, two hundred twenty-one billion, three hundred sixty-four million, three hundred forty thousand, four hundred twenty-one".