102021211101091 has 2 divisors, whose sum is σ = 102021211101092. Its totient is φ = 102021211101090.

The previous prime is 102021211101067. The next prime is 102021211101119. The reversal of 102021211101091 is 190101112120201.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102021211101091 is a prime.

It is not a weakly prime, because it can be changed into another prime (102021211101001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51010605550545 + 51010605550546.

It is an arithmetic number, because the mean of its divisors is an integer number (51010605550546).

Almost surely, 2^{102021211101091} is an apocalyptic number.

102021211101091 is a deficient number, since it is larger than the sum of its proper divisors (1).

102021211101091 is an equidigital number, since it uses as much as digits as its factorization.

102021211101091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 22.

Adding to 102021211101091 its reverse (190101112120201), we get a palindrome (292122323221292).

The spelling of 102021211101091 in words is "one hundred two trillion, twenty-one billion, two hundred eleven million, one hundred one thousand, ninety-one".