21010002102001 has 32 divisors (see below), whose sum is σ = 23221378252800. Its totient is φ = 18850549193280.

The previous prime is 21010002101981. The next prime is 21010002102031. The reversal of 21010002102001 is 10020120001012.

It is a cyclic number.

It is not a de Polignac number, because 21010002102001 - 2⁷ = 21010002101873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21010002102031) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 988834960 + ... + 988856206.

It is an arithmetic number, because the mean of its divisors is an integer number (725668070400).

Almost surely, 2^{21010002102001} is an apocalyptic number.

It is an amenable number.

21010002102001 is a deficient number, since it is larger than the sum of its proper divisors (2211376150799).

21010002102001 is a wasteful number, since it uses less digits than its factorization.

21010002102001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25189.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21010002102001 its reverse (10020120001012), we get a palindrome (31030122103013).

The spelling of 21010002102001 in words is "twenty-one trillion, ten billion, two million, one hundred two thousand, one".