2121252051 has 4 divisors (see below), whose sum is σ = 2828336072. Its totient is φ = 1414168032.

The previous prime is 2121252047. The next prime is 2121252083. The reversal of 2121252051 is 1502521212.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2121252051 - 2² = 2121252047 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121252041) 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, 353542006 + ... + 353542011.

It is an arithmetic number, because the mean of its divisors is an integer number (707084018).

Almost surely, 2^2121252051 is an apocalyptic number.

2121252051 is a deficient number, since it is larger than the sum of its proper divisors (707084021).

2121252051 is an equidigital number, since it uses as much as digits as its factorization.

2121252051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707084020.

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 2121252051 is about 46057.0521310255. The cubic root of 2121252051 is about 1284.8845048533.

Adding to 2121252051 its reverse (1502521212), we get a palindrome (3623773263).

The spelling of 2121252051 in words is "two billion, one hundred twenty-one million, two hundred fifty-two thousand, fifty-one".