2141121551 has 4 divisors (see below), whose sum is σ = 2141288400. Its totient is φ = 2140954704.

The previous prime is 2141121539. The next prime is 2141121583. The reversal of 2141121551 is 1551211412.

It is a happy number.

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 2141121551 - 2⁶ = 2141121487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2141121251) 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, 62411 + ... + 90428.

It is an arithmetic number, because the mean of its divisors is an integer number (535322100).

Almost surely, 2^2141121551 is an apocalyptic number.

2141121551 is a deficient number, since it is larger than the sum of its proper divisors (166849).

2141121551 is a wasteful number, since it uses less digits than its factorization.

2141121551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166848.

The product of its digits is 400, while the sum is 23.

The square root of 2141121551 is about 46272.2546565434. The cubic root of 2141121551 is about 1288.8838272908.

Adding to 2141121551 its reverse (1551211412), we get a palindrome (3692332963).

The spelling of 2141121551 in words is "two billion, one hundred forty-one million, one hundred twenty-one thousand, five hundred fifty-one".