2101123551 has 32 divisors (see below), whose sum is σ = 3092117760. Its totient is φ = 1263499776.

The previous prime is 2101123543. The next prime is 2101123553. The reversal of 2101123551 is 1553211012.

It is not a de Polignac number, because 2101123551 - 2³ = 2101123543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101123553) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 118120 + ... + 134738.

It is an arithmetic number, because the mean of its divisors is an integer number (96628680).

Almost surely, 2^2101123551 is an apocalyptic number.

2101123551 is a deficient number, since it is larger than the sum of its proper divisors (990994209).

2101123551 is a wasteful number, since it uses less digits than its factorization.

2101123551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16743.

The product of its (nonzero) digits is 300, while the sum is 21.

The square root of 2101123551 is about 45838.0142567280. The cubic root of 2101123551 is about 1280.8075045876.

Adding to 2101123551 its reverse (1553211012), we get a palindrome (3654334563).

The spelling of 2101123551 in words is "two billion, one hundred one million, one hundred twenty-three thousand, five hundred fifty-one".