2102071557021 has 16 divisors (see below), whose sum is σ = 2870751723840. Its totient is φ = 1367450058240.

The previous prime is 2102071556989. The next prime is 2102071557041. The reversal of 2102071557021 is 1207551702012.

It is not a de Polignac number, because 2102071557021 - 2⁵ = 2102071556989 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102071557041) 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, 7848276 + ... + 8111693.

It is an arithmetic number, because the mean of its divisors is an integer number (179421982740).

Almost surely, 2^{2102071557021} is an apocalyptic number.

It is an amenable number.

2102071557021 is a deficient number, since it is larger than the sum of its proper divisors (768680166819).

2102071557021 is a wasteful number, since it uses less digits than its factorization.

2102071557021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15961036.

The product of its (nonzero) digits is 9800, while the sum is 33.

The spelling of 2102071557021 in words is "two trillion, one hundred two billion, seventy-one million, five hundred fifty-seven thousand, twenty-one".