19999902221 has 8 divisors (see below), whose sum is σ = 21571861920. Its totient is φ = 18432729072.

The previous prime is 19999902203. The next prime is 19999902239. The reversal of 19999902221 is 12220999991.

It is an interprime number because it is at equal distance from previous prime (19999902203) and next prime (19999902239).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19999902221 - 2¹⁴ = 19999885837 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 (19999901221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1187951 + ... + 1204668.

It is an arithmetic number, because the mean of its divisors is an integer number (2696482740).

Almost surely, 2^19999902221 is an apocalyptic number.

It is an amenable number.

19999902221 is a deficient number, since it is larger than the sum of its proper divisors (1571959699).

19999902221 is a wasteful number, since it uses less digits than its factorization.

19999902221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2393275.

The product of its (nonzero) digits is 472392, while the sum is 53.

The spelling of 19999902221 in words is "nineteen billion, nine hundred ninety-nine million, nine hundred two thousand, two hundred twenty-one".