190911212021 has 2 divisors, whose sum is σ = 190911212022. Its totient is φ = 190911212020.

The previous prime is 190911212003. The next prime is 190911212029. The reversal of 190911212021 is 120212119091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 190130009521 + 781202500 = 436039^2 + 27950^2 .

It is a cyclic number.

It is not a de Polignac number, because 190911212021 - 2⁶ = 190911211957 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (190911212029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95455606010 + 95455606011.

It is an arithmetic number, because the mean of its divisors is an integer number (95455606011).

Almost surely, 2^190911212021 is an apocalyptic number.

It is an amenable number.

190911212021 is a deficient number, since it is larger than the sum of its proper divisors (1).

190911212021 is an equidigital number, since it uses as much as digits as its factorization.

190911212021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 29.

The spelling of 190911212021 in words is "one hundred ninety billion, nine hundred eleven million, two hundred twelve thousand, twenty-one".