2101521071651 has 4 divisors (see below), whose sum is σ = 2118068481792. Its totient is φ = 2084973661512.

The previous prime is 2101521071647. The next prime is 2101521071701. The reversal of 2101521071651 is 1561701251012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2101521071651 - 2² = 2101521071647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2101521011651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8273704880 + ... + 8273705133.

It is an arithmetic number, because the mean of its divisors is an integer number (529517120448).

Almost surely, 2^{2101521071651} is an apocalyptic number.

2101521071651 is a deficient number, since it is larger than the sum of its proper divisors (16547410141).

2101521071651 is a wasteful number, since it uses less digits than its factorization.

2101521071651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16547410140.

The product of its (nonzero) digits is 4200, while the sum is 32.

The spelling of 2101521071651 in words is "two trillion, one hundred one billion, five hundred twenty-one million, seventy-one thousand, six hundred fifty-one".