21223514091 has 16 divisors (see below), whose sum is σ = 30497062176. Its totient is φ = 13051078656.

The previous prime is 21223514041. The next prime is 21223514101. The reversal of 21223514091 is 19041532212.

It is not a de Polignac number, because 21223514091 - 2⁷ = 21223513963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21223514041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 144630 + ... + 251723.

It is an arithmetic number, because the mean of its divisors is an integer number (1906066386).

Almost surely, 2^21223514091 is an apocalyptic number.

21223514091 is a deficient number, since it is larger than the sum of its proper divisors (9273548085).

21223514091 is a wasteful number, since it uses less digits than its factorization.

21223514091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397742.

The product of its (nonzero) digits is 4320, while the sum is 30.

The spelling of 21223514091 in words is "twenty-one billion, two hundred twenty-three million, five hundred fourteen thousand, ninety-one".