190012021 has 2 divisors, whose sum is σ = 190012022. Its totient is φ = 190012020.

The previous prime is 190011979. The next prime is 190012033. The reversal of 190012021 is 120210091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 104652900 + 85359121 = 10230^2 + 9239^2 .

It is an emirp because it is prime and its reverse (120210091) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 190012021 - 2⁷ = 190011893 is a prime.

It is a super-2 number, since 2×190012021² = 72209136249008882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 190011986 and 190012004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (190012061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95006010 + 95006011.

It is an arithmetic number, because the mean of its divisors is an integer number (95006011).

Almost surely, 2^190012021 is an apocalyptic number.

It is an amenable number.

190012021 is a deficient number, since it is larger than the sum of its proper divisors (1).

190012021 is an equidigital number, since it uses as much as digits as its factorization.

190012021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 190012021 is about 13784.4847926936. The cubic root of 190012021 is about 574.9018317602.

The spelling of 190012021 in words is "one hundred ninety million, twelve thousand, twenty-one".