1012021211951 has 2 divisors, whose sum is σ = 1012021211952. Its totient is φ = 1012021211950.

The previous prime is 1012021211941. The next prime is 1012021212067. The reversal of 1012021211951 is 1591121202101.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1012021211951 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1012021211951.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1012021211941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 506010605975 + 506010605976.

It is an arithmetic number, because the mean of its divisors is an integer number (506010605976).

Almost surely, 2^{1012021211951} is an apocalyptic number.

1012021211951 is a deficient number, since it is larger than the sum of its proper divisors (1).

1012021211951 is an equidigital number, since it uses as much as digits as its factorization.

1012021211951 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 26.

The spelling of 1012021211951 in words is "one trillion, twelve billion, twenty-one million, two hundred eleven thousand, nine hundred fifty-one".