21001001202151 has 2 divisors, whose sum is σ = 21001001202152. Its totient is φ = 21001001202150.

The previous prime is 21001001202149. The next prime is 21001001202241. The reversal of 21001001202151 is 15120210010012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21001001202151 - 2¹ = 21001001202149 is a prime.

Together with 21001001202149, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21001001202551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500500601075 + 10500500601076.

It is an arithmetic number, because the mean of its divisors is an integer number (10500500601076).

Almost surely, 2^{21001001202151} is an apocalyptic number.

21001001202151 is a deficient number, since it is larger than the sum of its proper divisors (1).

21001001202151 is an equidigital number, since it uses as much as digits as its factorization.

21001001202151 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40, while the sum is 16.

Adding to 21001001202151 its reverse (15120210010012), we get a palindrome (36121211212163).

The spelling of 21001001202151 in words is "twenty-one trillion, one billion, one million, two hundred two thousand, one hundred fifty-one".