21203213001 has 16 divisors (see below), whose sum is σ = 29807020800. Its totient is φ = 13369846608.

The previous prime is 21203212993. The next prime is 21203213023. The reversal of 21203213001 is 10031230212.

It is not a de Polignac number, because 21203213001 - 2³ = 21203212993 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21203213041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 265191 + ... + 335756.

It is an arithmetic number, because the mean of its divisors is an integer number (1862938800).

Almost surely, 2^21203213001 is an apocalyptic number.

It is an amenable number.

21203213001 is a deficient number, since it is larger than the sum of its proper divisors (8603807799).

21203213001 is a wasteful number, since it uses less digits than its factorization.

21203213001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 601588.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21203213001 its reverse (10031230212), we get a palindrome (31234443213).

The spelling of 21203213001 in words is "twenty-one billion, two hundred three million, two hundred thirteen thousand, one".