21020221259 has 2 divisors, whose sum is σ = 21020221260. Its totient is φ = 21020221258.

The previous prime is 21020221153. The next prime is 21020221273. The reversal of 21020221259 is 95212202012.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21020221259 is a prime.

It is a super-3 number, since 3×21020221259³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (21020221279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510110629 + 10510110630.

It is an arithmetic number, because the mean of its divisors is an integer number (10510110630).

Almost surely, 2^21020221259 is an apocalyptic number.

21020221259 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020221259 is an equidigital number, since it uses as much as digits as its factorization.

21020221259 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 26.

The spelling of 21020221259 in words is "twenty-one billion, twenty million, two hundred twenty-one thousand, two hundred fifty-nine".