7890010101221 has 4 divisors (see below), whose sum is σ = 7890198705312. Its totient is φ = 7889821497132.

The previous prime is 7890010101209. The next prime is 7890010101247. The reversal of 7890010101221 is 1221010100987.

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 7890010101221 - 2¹⁴ = 7890010084837 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 (7890010101521) 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, 94239281 + ... + 94322966.

It is an arithmetic number, because the mean of its divisors is an integer number (1972549676328).

Almost surely, 2^{7890010101221} is an apocalyptic number.

It is an amenable number.

7890010101221 is a deficient number, since it is larger than the sum of its proper divisors (188604091).

7890010101221 is a wasteful number, since it uses less digits than its factorization.

7890010101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188604090.

The product of its (nonzero) digits is 2016, while the sum is 32.

The spelling of 7890010101221 in words is "seven trillion, eight hundred ninety billion, ten million, one hundred one thousand, two hundred twenty-one".