2121344452451 has 16 divisors (see below), whose sum is σ = 2456273702400. Its totient is φ = 1794432901248.

The previous prime is 2121344452441. The next prime is 2121344452463. The reversal of 2121344452451 is 1542544431212.

It is a cyclic number.

It is not a de Polignac number, because 2121344452451 - 2¹⁴ = 2121344436067 is a prime.

It is a super-3 number, since 3×2121344452451³ (a number of 38 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (2121344452441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1452566 + ... + 2520443.

It is an arithmetic number, because the mean of its divisors is an integer number (153517106400).

Almost surely, 2^{2121344452451} is an apocalyptic number.

2121344452451 is a deficient number, since it is larger than the sum of its proper divisors (334929249949).

2121344452451 is an equidigital number, since it uses as much as digits as its factorization.

2121344452451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3974018.

The product of its digits is 153600, while the sum is 38.

Adding to 2121344452451 its reverse (1542544431212), we get a palindrome (3663888883663).

The spelling of 2121344452451 in words is "two trillion, one hundred twenty-one billion, three hundred forty-four million, four hundred fifty-two thousand, four hundred fifty-one".