21102101012091 has 32 divisors (see below), whose sum is σ = 30712637030400. Its totient is φ = 12781374594080.

The previous prime is 21102101012071. The next prime is 21102101012119. The reversal of 21102101012091 is 19021010120112.

It is a cyclic number.

It is not a de Polignac number, because 21102101012091 - 2¹⁷ = 21102100881019 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21102101012071) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 392066980 + ... + 392120798.

It is an arithmetic number, because the mean of its divisors is an integer number (959769907200).

Almost surely, 2^{21102101012091} is an apocalyptic number.

21102101012091 is a deficient number, since it is larger than the sum of its proper divisors (9610536018309).

21102101012091 is a wasteful number, since it uses less digits than its factorization.

21102101012091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60839.

The product of its (nonzero) digits is 72, while the sum is 21.

The spelling of 21102101012091 in words is "twenty-one trillion, one hundred two billion, one hundred one million, twelve thousand, ninety-one".