211511315051 has 4 divisors (see below), whose sum is σ = 214059644232. Its totient is φ = 208962985872.

The previous prime is 211511315047. The next prime is 211511315053. The reversal of 211511315051 is 150513115112.

It is a happy number.

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 211511315051 - 2² = 211511315047 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 211511315051.

It is not an unprimeable number, because it can be changed into a prime (211511315053) 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, 1274164466 + ... + 1274164631.

It is an arithmetic number, because the mean of its divisors is an integer number (53514911058).

Almost surely, 2^211511315051 is an apocalyptic number.

211511315051 is a deficient number, since it is larger than the sum of its proper divisors (2548329181).

211511315051 is an equidigital number, since it uses as much as digits as its factorization.

211511315051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2548329180.

The product of its (nonzero) digits is 750, while the sum is 26.

The spelling of 211511315051 in words is "two hundred eleven billion, five hundred eleven million, three hundred fifteen thousand, fifty-one".