2120105556431 has 2 divisors, whose sum is σ = 2120105556432. Its totient is φ = 2120105556430.

The previous prime is 2120105556409. The next prime is 2120105556463. The reversal of 2120105556431 is 1346555010212.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2120105556431 is a prime.

It is a super-2 number, since 2×2120105556431² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2120105556391 and 2120105556400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2120105556631) 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, 1060052778215 + 1060052778216.

It is an arithmetic number, because the mean of its divisors is an integer number (1060052778216).

Almost surely, 2^{2120105556431} is an apocalyptic number.

2120105556431 is a deficient number, since it is larger than the sum of its proper divisors (1).

2120105556431 is an equidigital number, since it uses as much as digits as its factorization.

2120105556431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36000, while the sum is 35.

The spelling of 2120105556431 in words is "two trillion, one hundred twenty billion, one hundred five million, five hundred fifty-six thousand, four hundred thirty-one".