21277703533 has 2 divisors, whose sum is σ = 21277703534. Its totient is φ = 21277703532.

The previous prime is 21277703509. The next prime is 21277703561. The reversal of 21277703533 is 33530777212.

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., 18069274084 + 3208429449 = 134422^2 + 56643^2 .

It is a cyclic number.

It is not a de Polignac number, because 21277703533 - 2¹⁷ = 21277572461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21277704533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10638851766 + 10638851767.

It is an arithmetic number, because the mean of its divisors is an integer number (10638851767).

Almost surely, 2^21277703533 is an apocalyptic number.

It is an amenable number.

21277703533 is a deficient number, since it is larger than the sum of its proper divisors (1).

21277703533 is an equidigital number, since it uses as much as digits as its factorization.

21277703533 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 185220, while the sum is 40.

The spelling of 21277703533 in words is "twenty-one billion, two hundred seventy-seven million, seven hundred three thousand, five hundred thirty-three".