21023201000251 has 2 divisors, whose sum is σ = 21023201000252. Its totient is φ = 21023201000250.

The previous prime is 21023201000233. The next prime is 21023201000257. The reversal of 21023201000251 is 15200010232012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21023201000251 - 2²⁹ = 21022664129339 is a prime.

It is not a weakly prime, because it can be changed into another prime (21023201000257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511600500125 + 10511600500126.

It is an arithmetic number, because the mean of its divisors is an integer number (10511600500126).

Almost surely, 2^{21023201000251} is an apocalyptic number.

21023201000251 is a deficient number, since it is larger than the sum of its proper divisors (1).

21023201000251 is an equidigital number, since it uses as much as digits as its factorization.

21023201000251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 19.

Adding to 21023201000251 its reverse (15200010232012), we get a palindrome (36223211232263).

The spelling of 21023201000251 in words is "twenty-one trillion, twenty-three billion, two hundred one million, two hundred fifty-one", and thus it is an aban number.