7904212421 has 16 divisors (see below), whose sum is σ = 9352506240. Its totient is φ = 6536080320.

The previous prime is 7904212367. The next prime is 7904212457. The reversal of 7904212421 is 1242124097.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-7904212421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7904212471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 243986 + ... + 274476.

It is an arithmetic number, because the mean of its divisors is an integer number (584531640).

Almost surely, 2^7904212421 is an apocalyptic number.

It is an amenable number.

7904212421 is a deficient number, since it is larger than the sum of its proper divisors (1448293819).

7904212421 is a wasteful number, since it uses less digits than its factorization.

7904212421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31804.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 7904212421 is about 88905.6377346229. The cubic root of 7904212421 is about 1991.9856295804.

The spelling of 7904212421 in words is "seven billion, nine hundred four million, two hundred twelve thousand, four hundred twenty-one".