21042327433 has 2 divisors, whose sum is σ = 21042327434. Its totient is φ = 21042327432.

The previous prime is 21042327421. The next prime is 21042327547. The reversal of 21042327433 is 33472324012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18702477049 + 2339850384 = 136757^2 + 48372^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21042327433 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21042327395 and 21042327404.

It is not a weakly prime, because it can be changed into another prime (21042357433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10521163716 + 10521163717.

It is an arithmetic number, because the mean of its divisors is an integer number (10521163717).

Almost surely, 2^21042327433 is an apocalyptic number.

It is an amenable number.

21042327433 is a deficient number, since it is larger than the sum of its proper divisors (1).

21042327433 is an equidigital number, since it uses as much as digits as its factorization.

21042327433 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 31.

The spelling of 21042327433 in words is "twenty-one billion, forty-two million, three hundred twenty-seven thousand, four hundred thirty-three".