21049026111437 has 2 divisors, whose sum is σ = 21049026111438. Its totient is φ = 21049026111436.

The previous prime is 21049026111433. The next prime is 21049026111461. The reversal of 21049026111437 is 73411162094012.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11980140802756 + 9068885308681 = 3461234^2 + 3011459^2 .

It is a cyclic number.

It is not a de Polignac number, because 21049026111437 - 2² = 21049026111433 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21049026111394 and 21049026111403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21049026111433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10524513055718 + 10524513055719.

It is an arithmetic number, because the mean of its divisors is an integer number (10524513055719).

Almost surely, 2^{21049026111437} is an apocalyptic number.

It is an amenable number.

21049026111437 is a deficient number, since it is larger than the sum of its proper divisors (1).

21049026111437 is an equidigital number, since it uses as much as digits as its factorization.

21049026111437 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 41.

The spelling of 21049026111437 in words is "twenty-one trillion, forty-nine billion, twenty-six million, one hundred eleven thousand, four hundred thirty-seven".