1111212021971 has 2 divisors, whose sum is σ = 1111212021972. Its totient is φ = 1111212021970.

The previous prime is 1111212021967. The next prime is 1111212022027. The reversal of 1111212021971 is 1791202121111.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1111212021971 - 2² = 1111212021967 is a prime.

It is not a weakly prime, because it can be changed into another prime (1111212021961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555606010985 + 555606010986.

It is an arithmetic number, because the mean of its divisors is an integer number (555606010986).

Almost surely, 2^{1111212021971} is an apocalyptic number.

1111212021971 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111212021971 is an equidigital number, since it uses as much as digits as its factorization.

1111212021971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 29.

The spelling of 1111212021971 in words is "one trillion, one hundred eleven billion, two hundred twelve million, twenty-one thousand, nine hundred seventy-one".