1210210005257 has 4 divisors (see below), whose sum is σ = 1320229096656. Its totient is φ = 1100190913860.

The previous prime is 1210210005163. The next prime is 1210210005281. The reversal of 1210210005257 is 7525000120121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1210210005257 - 2⁸ = 1210210005001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1210210005757) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55009545683 + ... + 55009545704.

It is an arithmetic number, because the mean of its divisors is an integer number (330057274164).

Almost surely, 2^{1210210005257} is an apocalyptic number.

It is an amenable number.

1210210005257 is a deficient number, since it is larger than the sum of its proper divisors (110019091399).

1210210005257 is a wasteful number, since it uses less digits than its factorization.

1210210005257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110019091398.

The product of its (nonzero) digits is 1400, while the sum is 26.

Adding to 1210210005257 its reverse (7525000120121), we get a palindrome (8735210125378).

The spelling of 1210210005257 in words is "one trillion, two hundred ten billion, two hundred ten million, five thousand, two hundred fifty-seven".