21000002102231 has 2 divisors, whose sum is σ = 21000002102232. Its totient is φ = 21000002102230.

The previous prime is 21000002102207. The next prime is 21000002102251. The reversal of 21000002102231 is 13220120000012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21000002102231 - 2¹⁰ = 21000002101207 is a prime.

It is a super-2 number, since 2×21000002102231² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21000002102251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500001051115 + 10500001051116.

It is an arithmetic number, because the mean of its divisors is an integer number (10500001051116).

Almost surely, 2^{21000002102231} is an apocalyptic number.

21000002102231 is a deficient number, since it is larger than the sum of its proper divisors (1).

21000002102231 is an equidigital number, since it uses as much as digits as its factorization.

21000002102231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21000002102231 its reverse (13220120000012), we get a palindrome (34220122102243).

The spelling of 21000002102231 in words is "twenty-one trillion, two million, one hundred two thousand, two hundred thirty-one".