2126887816901 has 4 divisors (see below), whose sum is σ = 2251998864972. Its totient is φ = 2001776768832.

The previous prime is 2126887816849. The next prime is 2126887816909. The reversal of 2126887816901 is 1096187886212.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1408078890625 + 718808926276 = 1186625^2 + 847826^2 .

It is a cyclic number.

It is not a de Polignac number, because 2126887816901 - 2¹⁴ = 2126887800517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2126887816909) 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, 62555524010 + ... + 62555524043.

It is an arithmetic number, because the mean of its divisors is an integer number (562999716243).

Almost surely, 2^{2126887816901} is an apocalyptic number.

It is an amenable number.

2126887816901 is a deficient number, since it is larger than the sum of its proper divisors (125111048071).

2126887816901 is a wasteful number, since it uses less digits than its factorization.

2126887816901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125111048070.

The product of its (nonzero) digits is 4644864, while the sum is 59.

The spelling of 2126887816901 in words is "two trillion, one hundred twenty-six billion, eight hundred eighty-seven million, eight hundred sixteen thousand, nine hundred one".