1264000021421 has 4 divisors (see below), whose sum is σ = 1265026830144. Its totient is φ = 1262973212700.

The previous prime is 1264000021381. The next prime is 1264000021439. The reversal of 1264000021421 is 1241200004621.

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 1264000021421 - 2²² = 1263995827117 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 (1264000021441) 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, 513402515 + ... + 513404976.

It is an arithmetic number, because the mean of its divisors is an integer number (316256707536).

Almost surely, 2^{1264000021421} is an apocalyptic number.

It is an amenable number.

1264000021421 is a deficient number, since it is larger than the sum of its proper divisors (1026808723).

1264000021421 is a wasteful number, since it uses less digits than its factorization.

1264000021421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1026808722.

The product of its (nonzero) digits is 768, while the sum is 23.

The spelling of 1264000021421 in words is "one trillion, two hundred sixty-four billion, twenty-one thousand, four hundred twenty-one".