21073933 has 2 divisors, whose sum is σ = 21073934. Its totient is φ = 21073932.

The previous prime is 21073919. The next prime is 21073967. The reversal of 21073933 is 33937012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20912329 + 161604 = 4573^2 + 402^2 .

It is a cyclic number.

It is not a de Polignac number, because 21073933 - 2¹³ = 21065741 is a prime.

It is a super-2 number, since 2×21073933² = 888221304176978, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21076933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10536966 + 10536967.

It is an arithmetic number, because the mean of its divisors is an integer number (10536967).

Almost surely, 2^21073933 is an apocalyptic number.

It is an amenable number.

21073933 is a deficient number, since it is larger than the sum of its proper divisors (1).

21073933 is an equidigital number, since it uses as much as digits as its factorization.

21073933 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3402, while the sum is 28.

The square root of 21073933 is about 4590.6353590761. The cubic root of 21073933 is about 276.2158091220.

The spelling of 21073933 in words is "twenty-one million, seventy-three thousand, nine hundred thirty-three".