21213325091 has 8 divisors (see below), whose sum is σ = 24254446944. Its totient is φ = 18174864960.

The previous prime is 21213325069. The next prime is 21213325187. The reversal of 21213325091 is 19052331212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21213325091 - 2¹⁸ = 21213062947 is a prime.

It is a super-2 number, since 2×21213325091² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21213325051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 648320 + ... + 680253.

It is an arithmetic number, because the mean of its divisors is an integer number (3031805868).

Almost surely, 2^21213325091 is an apocalyptic number.

21213325091 is a deficient number, since it is larger than the sum of its proper divisors (3041121853).

21213325091 is a wasteful number, since it uses less digits than its factorization.

21213325091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1330861.

The product of its (nonzero) digits is 3240, while the sum is 29.

The spelling of 21213325091 in words is "twenty-one billion, two hundred thirteen million, three hundred twenty-five thousand, ninety-one".