3331999621 has 2 divisors, whose sum is σ = 3331999622. Its totient is φ = 3331999620.

The previous prime is 3331999607. The next prime is 3331999639. The reversal of 3331999621 is 1269991333.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2883153025 + 448846596 = 53695^2 + 21186^2 .

It is a cyclic number.

It is not a de Polignac number, because 3331999621 - 2⁷ = 3331999493 is a prime.

It is a super-2 number, since 2×3331999621² = 22204442948688287282, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3331999661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1665999810 + 1665999811.

It is an arithmetic number, because the mean of its divisors is an integer number (1665999811).

Almost surely, 2^3331999621 is an apocalyptic number.

It is an amenable number.

3331999621 is a deficient number, since it is larger than the sum of its proper divisors (1).

3331999621 is an equidigital number, since it uses as much as digits as its factorization.

3331999621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 236196, while the sum is 46.

The square root of 3331999621 is about 57723.4754757542. The cubic root of 3331999621 is about 1493.6023254489.

The spelling of 3331999621 in words is "three billion, three hundred thirty-one million, nine hundred ninety-nine thousand, six hundred twenty-one".