1021214403251 has 16 divisors (see below), whose sum is σ = 1170075793920. Its totient is φ = 873097496640.

The previous prime is 1021214403239. The next prime is 1021214403263. The reversal of 1021214403251 is 1523044121201.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1021214403239) and next prime (1021214403263).

It is a cyclic number.

It is not a de Polignac number, because 1021214403251 - 2³⁴ = 1004034534067 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1021214403251.

It is not an unprimeable number, because it can be changed into a prime (1021214453251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11883500 + ... + 11969126.

It is an arithmetic number, because the mean of its divisors is an integer number (73129737120).

Almost surely, 2^{1021214403251} is an apocalyptic number.

1021214403251 is a deficient number, since it is larger than the sum of its proper divisors (148861390669).

1021214403251 is an equidigital number, since it uses as much as digits as its factorization.

1021214403251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89954.

The product of its (nonzero) digits is 1920, while the sum is 26.

Adding to 1021214403251 its reverse (1523044121201), we get a palindrome (2544258524452).

The spelling of 1021214403251 in words is "one trillion, twenty-one billion, two hundred fourteen million, four hundred three thousand, two hundred fifty-one".