21002203001 has 16 divisors (see below), whose sum is σ = 23358585600. Its totient is φ = 18760925568.

The previous prime is 21002202961. The next prime is 21002203007. The reversal of 21002203001 is 10030220012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21002203001 - 2¹⁰ = 21002201977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21002203007) 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, 138731 + ... + 247488.

It is an arithmetic number, because the mean of its divisors is an integer number (1459911600).

Almost surely, 2^21002203001 is an apocalyptic number.

It is an amenable number.

21002203001 is a deficient number, since it is larger than the sum of its proper divisors (2356382599).

21002203001 is a wasteful number, since it uses less digits than its factorization.

21002203001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386368.

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 21002203001 its reverse (10030220012), we get a palindrome (31032423013).

The spelling of 21002203001 in words is "twenty-one billion, two million, two hundred three thousand, one".