7864087106221 has 4 divisors (see below), whose sum is σ = 7912333039552. Its totient is φ = 7815841172892.

The previous prime is 7864087106203. The next prime is 7864087106233. The reversal of 7864087106221 is 1226017804687.

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 7864087106221 - 2²⁵ = 7864053551789 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 (7864087106321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24122966421 + ... + 24122966746.

It is an arithmetic number, because the mean of its divisors is an integer number (1978083259888).

Almost surely, 2^{7864087106221} is an apocalyptic number.

It is an amenable number.

7864087106221 is a deficient number, since it is larger than the sum of its proper divisors (48245933331).

7864087106221 is a wasteful number, since it uses less digits than its factorization.

7864087106221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48245933330.

The product of its (nonzero) digits is 1806336, while the sum is 52.

The spelling of 7864087106221 in words is "seven trillion, eight hundred sixty-four billion, eighty-seven million, one hundred six thousand, two hundred twenty-one".