2101121951 has 2 divisors, whose sum is σ = 2101121952. Its totient is φ = 2101121950.

The previous prime is 2101121929. The next prime is 2101121959. The reversal of 2101121951 is 1591211012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2101121951 - 2²⁶ = 2034013087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2101121959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050560975 + 1050560976.

It is an arithmetic number, because the mean of its divisors is an integer number (1050560976).

Almost surely, 2^2101121951 is an apocalyptic number.

2101121951 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101121951 is an equidigital number, since it uses as much as digits as its factorization.

2101121951 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 23.

The square root of 2101121951 is about 45837.9968039617. The cubic root of 2101121951 is about 1280.8071794770.

Adding to 2101121951 its reverse (1591211012), we get a palindrome (3692332963).

The spelling of 2101121951 in words is "two billion, one hundred one million, one hundred twenty-one thousand, nine hundred fifty-one".