201990006621 has 24 divisors (see below), whose sum is σ = 314643813120. Its totient is φ = 124128609696.

The previous prime is 201990006593. The next prime is 201990006629. The reversal of 201990006621 is 126600099102.

201990006621 is a `hidden beast` number, since 20 + 1 + 9 + 9 + 0 + 0 + 0 + 6 + 621 = 666.

It is not a de Polignac number, because 201990006621 - 2³⁰ = 200916264797 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201990006629) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1116441 + ... + 1284686.

It is an arithmetic number, because the mean of its divisors is an integer number (13110158880).

Almost surely, 2^201990006621 is an apocalyptic number.

It is an amenable number.

201990006621 is a deficient number, since it is larger than the sum of its proper divisors (112653806499).

201990006621 is a wasteful number, since it uses less digits than its factorization.

201990006621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2401865 (or 2401862 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The spelling of 201990006621 in words is "two hundred one billion, nine hundred ninety million, six thousand, six hundred twenty-one".