20110219991 has 2 divisors, whose sum is σ = 20110219992. Its totient is φ = 20110219990.

The previous prime is 20110219973. The next prime is 20110220021. The reversal of 20110219991 is 19991201102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20110219991 - 2¹⁰ = 20110218967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20110216991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055109995 + 10055109996.

It is an arithmetic number, because the mean of its divisors is an integer number (10055109996).

Almost surely, 2^20110219991 is an apocalyptic number.

20110219991 is a deficient number, since it is larger than the sum of its proper divisors (1).

20110219991 is an equidigital number, since it uses as much as digits as its factorization.

20110219991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 35.

The spelling of 20110219991 in words is "twenty billion, one hundred ten million, two hundred nineteen thousand, nine hundred ninety-one".