71212421251 has 2 divisors, whose sum is σ = 71212421252. Its totient is φ = 71212421250.

The previous prime is 71212421207. The next prime is 71212421263. The reversal of 71212421251 is 15212421217.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 71212421251 - 2⁹ = 71212420739 is a prime.

It is not a weakly prime, because it can be changed into another prime (71212451251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35606210625 + 35606210626.

It is an arithmetic number, because the mean of its divisors is an integer number (35606210626).

Almost surely, 2^71212421251 is an apocalyptic number.

71212421251 is a deficient number, since it is larger than the sum of its proper divisors (1).

71212421251 is an equidigital number, since it uses as much as digits as its factorization.

71212421251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2240, while the sum is 28.

Adding to 71212421251 its reverse (15212421217), we get a palindrome (86424842468).

The spelling of 71212421251 in words is "seventy-one billion, two hundred twelve million, four hundred twenty-one thousand, two hundred fifty-one".