2121520051423 has 2 divisors, whose sum is σ = 2121520051424. Its totient is φ = 2121520051422.

The previous prime is 2121520051411. The next prime is 2121520051487. The reversal of 2121520051423 is 3241500251212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121520051423 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2121520051391 and 2121520051400.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121520051403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060760025711 + 1060760025712.

It is an arithmetic number, because the mean of its divisors is an integer number (1060760025712).

Almost surely, 2^{2121520051423} is an apocalyptic number.

2121520051423 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121520051423 is an equidigital number, since it uses as much as digits as its factorization.

2121520051423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4800, while the sum is 28.

The spelling of 2121520051423 in words is "two trillion, one hundred twenty-one billion, five hundred twenty million, fifty-one thousand, four hundred twenty-three".