2101511041251 has 4 divisors (see below), whose sum is σ = 2802014721672. Its totient is φ = 1401007360832.

The previous prime is 2101511041249. The next prime is 2101511041277. The reversal of 2101511041251 is 1521401151012.

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 2101511041251 - 2¹ = 2101511041249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2101511041291) 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, 350251840206 + ... + 350251840211.

It is an arithmetic number, because the mean of its divisors is an integer number (700503680418).

Almost surely, 2^{2101511041251} is an apocalyptic number.

2101511041251 is a deficient number, since it is larger than the sum of its proper divisors (700503680421).

2101511041251 is an equidigital number, since it uses as much as digits as its factorization.

2101511041251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700503680420.

The product of its (nonzero) digits is 400, while the sum is 24.

Adding to 2101511041251 its reverse (1521401151012), we get a palindrome (3622912192263).

The spelling of 2101511041251 in words is "two trillion, one hundred one billion, five hundred eleven million, forty-one thousand, two hundred fifty-one".