3942903198921 has 16 divisors (see below), whose sum is σ = 5270884344000. Its totient is φ = 2621763194688.

The previous prime is 3942903198893. The next prime is 3942903198929. The reversal of 3942903198921 is 1298913092493.

It is not a de Polignac number, because 3942903198921 - 2¹⁰ = 3942903197897 is a prime.

It is a super-2 number, since 2×3942903198921² (a number of 26 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3942903198929) 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 15 ways as a sum of consecutive naturals, for example, 14898055 + ... + 15160403.

It is an arithmetic number, because the mean of its divisors is an integer number (329430271500).

Almost surely, 2^{3942903198921} is an apocalyptic number.

It is an amenable number.

3942903198921 is a deficient number, since it is larger than the sum of its proper divisors (1327981145079).

3942903198921 is a wasteful number, since it uses less digits than its factorization.

3942903198921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275368.

The product of its (nonzero) digits is 7558272, while the sum is 60.

The spelling of 3942903198921 in words is "three trillion, nine hundred forty-two billion, nine hundred three million, one hundred ninety-eight thousand, nine hundred twenty-one".