21203113001 has 4 divisors (see below), whose sum is σ = 24232129152. Its totient is φ = 18174096852.

The previous prime is 21203112989. The next prime is 21203113003. The reversal of 21203113001 is 10031130212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21203113001 - 2⁶ = 21203112937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21203113003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1514508065 + ... + 1514508078.

It is an arithmetic number, because the mean of its divisors is an integer number (6058032288).

Almost surely, 2^21203113001 is an apocalyptic number.

It is an amenable number.

21203113001 is a deficient number, since it is larger than the sum of its proper divisors (3029016151).

21203113001 is an equidigital number, since it uses as much as digits as its factorization.

21203113001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3029016150.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21203113001 its reverse (10031130212), we get a palindrome (31234243213).

The spelling of 21203113001 in words is "twenty-one billion, two hundred three million, one hundred thirteen thousand, one".