2102691091061 has 16 divisors (see below), whose sum is σ = 2312817712128. Its totient is φ = 1895745087600.

The previous prime is 2102691091057. The next prime is 2102691091069. The reversal of 2102691091061 is 1601901962012.

It is a cyclic number.

It is not a de Polignac number, because 2102691091061 - 2² = 2102691091057 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102691091069) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1820210 + ... + 2741996.

It is an arithmetic number, because the mean of its divisors is an integer number (144551107008).

Almost surely, 2^{2102691091061} is an apocalyptic number.

It is an amenable number.

2102691091061 is a deficient number, since it is larger than the sum of its proper divisors (210126621067).

2102691091061 is a wasteful number, since it uses less digits than its factorization.

2102691091061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 923512.

The product of its (nonzero) digits is 11664, while the sum is 38.

The spelling of 2102691091061 in words is "two trillion, one hundred two billion, six hundred ninety-one million, ninety-one thousand, sixty-one".