2121255001 has 4 divisors (see below), whose sum is σ = 2151131904. Its totient is φ = 2091378100.

The previous prime is 2121254999. The next prime is 2121255043. The reversal of 2121255001 is 1005521212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2121255001 - 2¹ = 2121254999 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 2121255001.

It is not an unprimeable number, because it can be changed into a prime (2121255601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14938345 + ... + 14938486.

It is an arithmetic number, because the mean of its divisors is an integer number (537782976).

Almost surely, 2^2121255001 is an apocalyptic number.

It is an amenable number.

2121255001 is a deficient number, since it is larger than the sum of its proper divisors (29876903).

2121255001 is an equidigital number, since it uses as much as digits as its factorization.

2121255001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29876902.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 2121255001 is about 46057.0841565117. The cubic root of 2121255001 is about 1284.8851004776.

Adding to 2121255001 its reverse (1005521212), we get a palindrome (3126776213).

The spelling of 2121255001 in words is "two billion, one hundred twenty-one million, two hundred fifty-five thousand, one".