21213303091 has 2 divisors, whose sum is σ = 21213303092. Its totient is φ = 21213303090.

The previous prime is 21213303071. The next prime is 21213303113. The reversal of 21213303091 is 19030331212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21213303091 - 2¹³ = 21213294899 is a prime.

It is not a weakly prime, because it can be changed into another prime (21213303011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606651545 + 10606651546.

It is an arithmetic number, because the mean of its divisors is an integer number (10606651546).

Almost surely, 2^21213303091 is an apocalyptic number.

21213303091 is a deficient number, since it is larger than the sum of its proper divisors (1).

21213303091 is an equidigital number, since it uses as much as digits as its factorization.

21213303091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 25.

The spelling of 21213303091 in words is "twenty-one billion, two hundred thirteen million, three hundred three thousand, ninety-one".