2121302232155 has 4 divisors (see below), whose sum is σ = 2545562678592. Its totient is φ = 1697041785720.

The previous prime is 2121302232121. The next prime is 2121302232173. The reversal of 2121302232155 is 5512322031212.

It is a happy number.

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

It is not a de Polignac number, because 2121302232155 - 2²² = 2121298037851 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212130223211 + ... + 212130223220.

It is an arithmetic number, because the mean of its divisors is an integer number (636390669648).

Almost surely, 2^{2121302232155} is an apocalyptic number.

2121302232155 is a deficient number, since it is larger than the sum of its proper divisors (424260446437).

2121302232155 is an equidigital number, since it uses as much as digits as its factorization.

2121302232155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424260446436.

The product of its (nonzero) digits is 7200, while the sum is 29.

Adding to 2121302232155 its reverse (5512322031212), we get a palindrome (7633624263367).

The spelling of 2121302232155 in words is "two trillion, one hundred twenty-one billion, three hundred two million, two hundred thirty-two thousand, one hundred fifty-five".