2121243036551 has 2 divisors, whose sum is σ = 2121243036552. Its totient is φ = 2121243036550.

The previous prime is 2121243036547. The next prime is 2121243036559. The reversal of 2121243036551 is 1556303421212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2121243036551 - 2² = 2121243036547 is a prime.

It is a super-2 number, since 2×2121243036551² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121243036559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060621518275 + 1060621518276.

It is an arithmetic number, because the mean of its divisors is an integer number (1060621518276).

Almost surely, 2^{2121243036551} is an apocalyptic number.

2121243036551 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121243036551 is an equidigital number, since it uses as much as digits as its factorization.

2121243036551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43200, while the sum is 35.

Adding to 2121243036551 its reverse (1556303421212), we get a palindrome (3677546457763).

The spelling of 2121243036551 in words is "two trillion, one hundred twenty-one billion, two hundred forty-three million, thirty-six thousand, five hundred fifty-one".