2101211199965 has 8 divisors (see below), whose sum is σ = 2523279265368. Its totient is φ = 1679751743040.

The previous prime is 2101211199929. The next prime is 2101211200007. The reversal of 2101211199965 is 5699911121012.

It can be written as a sum of positive squares in 4 ways, for example, as 595942312729 + 1505268887236 = 771973^2 + 1226894^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2101211199965 - 2¹⁰ = 2101211198941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152144522 + ... + 152158331.

It is an arithmetic number, because the mean of its divisors is an integer number (315409908171).

Almost surely, 2^{2101211199965} is an apocalyptic number.

It is an amenable number.

2101211199965 is a deficient number, since it is larger than the sum of its proper divisors (422068065403).

2101211199965 is a wasteful number, since it uses less digits than its factorization.

2101211199965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304304239.

The product of its (nonzero) digits is 87480, while the sum is 47.

The spelling of 2101211199965 in words is "two trillion, one hundred one billion, two hundred eleven million, one hundred ninety-nine thousand, nine hundred sixty-five".