21273061 has 2 divisors, whose sum is σ = 21273062. Its totient is φ = 21273060.

The previous prime is 21273023. The next prime is 21273067. The reversal of 21273061 is 16037212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15484225 + 5788836 = 3935^2 + 2406^2 .

It is a cyclic number.

It is not a de Polignac number, because 21273061 - 2¹³ = 21264869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21273067) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10636530 + 10636531.

It is an arithmetic number, because the mean of its divisors is an integer number (10636531).

Almost surely, 2^21273061 is an apocalyptic number.

It is an amenable number.

21273061 is a deficient number, since it is larger than the sum of its proper divisors (1).

21273061 is an equidigital number, since it uses as much as digits as its factorization.

21273061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 21273061 is about 4612.2728670364. The cubic root of 21273061 is about 277.0830727392.

The spelling of 21273061 in words is "twenty-one million, two hundred seventy-three thousand, sixty-one".