19990221601 has 8 divisors (see below), whose sum is σ = 22855049984. Its totient is φ = 17127663840.

The previous prime is 19990221593. The next prime is 19990221631. The reversal of 19990221601 is 10612209991.

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

It is not a de Polignac number, because 19990221601 - 2³ = 19990221593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19990221631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 548745 + ... + 584038.

It is an arithmetic number, because the mean of its divisors is an integer number (2856881248).

Almost surely, 2^19990221601 is an apocalyptic number.

It is an amenable number.

19990221601 is a deficient number, since it is larger than the sum of its proper divisors (2864828383).

19990221601 is a wasteful number, since it uses less digits than its factorization.

19990221601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1135311.

The product of its (nonzero) digits is 17496, while the sum is 40.

The spelling of 19990221601 in words is "nineteen billion, nine hundred ninety million, two hundred twenty-one thousand, six hundred one".