21032201997 has 6 divisors (see below), whose sum is σ = 30379847342. Its totient is φ = 14021467992.

The previous prime is 21032201989. The next prime is 21032202007. The reversal of 21032201997 is 79910223012.

It can be written as a sum of positive squares in only one way, i.e., 19942805961 + 1089396036 = 141219^2 + 33006^2 .

It is not a de Polignac number, because 21032201997 - 2³ = 21032201989 is a prime.

It is a super-3 number, since 3×21032201997³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21032281997) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1168455658 + ... + 1168455675.

Almost surely, 2^21032201997 is an apocalyptic number.

It is an amenable number.

21032201997 is a deficient number, since it is larger than the sum of its proper divisors (9347645345).

21032201997 is a wasteful number, since it uses less digits than its factorization.

21032201997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2336911339 (or 2336911336 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The spelling of 21032201997 in words is "twenty-one billion, thirty-two million, two hundred one thousand, nine hundred ninety-seven".