2126354381 has 2 divisors, whose sum is σ = 2126354382. Its totient is φ = 2126354380.

The previous prime is 2126354359. The next prime is 2126354389. The reversal of 2126354381 is 1834536212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1869265225 + 257089156 = 43235^2 + 16034^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2126354381 is a prime.

It is a super-2 number, since 2×2126354381² = 9042765907195786322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2126354389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1063177190 + 1063177191.

It is an arithmetic number, because the mean of its divisors is an integer number (1063177191).

Almost surely, 2^2126354381 is an apocalyptic number.

It is an amenable number.

2126354381 is a deficient number, since it is larger than the sum of its proper divisors (1).

2126354381 is an equidigital number, since it uses as much as digits as its factorization.

2126354381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 35.

The square root of 2126354381 is about 46112.4102709889. The cubic root of 2126354381 is about 1285.9138741786.

The spelling of 2126354381 in words is "two billion, one hundred twenty-six million, three hundred fifty-four thousand, three hundred eighty-one".