21253100262451 has 2 divisors, whose sum is σ = 21253100262452. Its totient is φ = 21253100262450.

The previous prime is 21253100262421. The next prime is 21253100262463. The reversal of 21253100262451 is 15426200135212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21253100262451 - 2¹³ = 21253100254259 is a prime.

It is not a weakly prime, because it can be changed into another prime (21253100262421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10626550131225 + 10626550131226.

It is an arithmetic number, because the mean of its divisors is an integer number (10626550131226).

Almost surely, 2^{21253100262451} is an apocalyptic number.

21253100262451 is a deficient number, since it is larger than the sum of its proper divisors (1).

21253100262451 is an equidigital number, since it uses as much as digits as its factorization.

21253100262451 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28800, while the sum is 34.

Adding to 21253100262451 its reverse (15426200135212), we get a palindrome (36679300397663).

The spelling of 21253100262451 in words is "twenty-one trillion, two hundred fifty-three billion, one hundred million, two hundred sixty-two thousand, four hundred fifty-one".