210100021091 has 2 divisors, whose sum is σ = 210100021092. Its totient is φ = 210100021090.

The previous prime is 210100021069. The next prime is 210100021133. The reversal of 210100021091 is 190120001012.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210100021091 is a prime.

It is not a weakly prime, because it can be changed into another prime (210100021031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105050010545 + 105050010546.

It is an arithmetic number, because the mean of its divisors is an integer number (105050010546).

Almost surely, 2^210100021091 is an apocalyptic number.

210100021091 is a deficient number, since it is larger than the sum of its proper divisors (1).

210100021091 is an equidigital number, since it uses as much as digits as its factorization.

210100021091 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 17.

The spelling of 210100021091 in words is "two hundred ten billion, one hundred million, twenty-one thousand, ninety-one".