21386731733 has 2 divisors, whose sum is σ = 21386731734. Its totient is φ = 21386731732.

The previous prime is 21386731727. The next prime is 21386731739. The reversal of 21386731733 is 33713768312.

It is a balanced prime because it is at equal distance from previous prime (21386731727) and next prime (21386731739).

It can be written as a sum of positive squares in only one way, i.e., 18283907524 + 3102824209 = 135218^2 + 55703^2 .

It is a cyclic number.

It is not a de Polignac number, because 21386731733 - 2¹⁴ = 21386715349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21386731739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10693365866 + 10693365867.

It is an arithmetic number, because the mean of its divisors is an integer number (10693365867).

Almost surely, 2^21386731733 is an apocalyptic number.

It is an amenable number.

21386731733 is a deficient number, since it is larger than the sum of its proper divisors (1).

21386731733 is an equidigital number, since it uses as much as digits as its factorization.

21386731733 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 381024, while the sum is 44.

The spelling of 21386731733 in words is "twenty-one billion, three hundred eighty-six million, seven hundred thirty-one thousand, seven hundred thirty-three".