20191939213 has 2 divisors, whose sum is σ = 20191939214. Its totient is φ = 20191939212.

The previous prime is 20191939123. The next prime is 20191939237. The reversal of 20191939213 is 31293919102.

Together with previous prime (20191939123) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11219681929 + 8972257284 = 105923^2 + 94722^2 .

It is a cyclic number.

It is not a de Polignac number, because 20191939213 - 2¹⁷ = 20191808141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20191939283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10095969606 + 10095969607.

It is an arithmetic number, because the mean of its divisors is an integer number (10095969607).

Almost surely, 2^20191939213 is an apocalyptic number.

It is an amenable number.

20191939213 is a deficient number, since it is larger than the sum of its proper divisors (1).

20191939213 is an equidigital number, since it uses as much as digits as its factorization.

20191939213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26244, while the sum is 40.

The spelling of 20191939213 in words is "twenty billion, one hundred ninety-one million, nine hundred thirty-nine thousand, two hundred thirteen".