2123210551551 has 4 divisors (see below), whose sum is σ = 2830947402072. Its totient is φ = 1415473701032.

The previous prime is 2123210551537. The next prime is 2123210551571. The reversal of 2123210551551 is 1551550123212.

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 2123210551551 - 2¹⁷ = 2123210420479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123210551531) 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, 353868425256 + ... + 353868425261.

It is an arithmetic number, because the mean of its divisors is an integer number (707736850518).

Almost surely, 2^{2123210551551} is an apocalyptic number.

2123210551551 is a deficient number, since it is larger than the sum of its proper divisors (707736850521).

2123210551551 is an equidigital number, since it uses as much as digits as its factorization.

2123210551551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707736850520.

The product of its (nonzero) digits is 15000, while the sum is 33.

Adding to 2123210551551 its reverse (1551550123212), we get a palindrome (3674760674763).

The spelling of 2123210551551 in words is "two trillion, one hundred twenty-three billion, two hundred ten million, five hundred fifty-one thousand, five hundred fifty-one".