21202022091 has 8 divisors (see below), whose sum is σ = 28870838784. Its totient is φ = 13833943400.

The previous prime is 21202022071. The next prime is 21202022117. The reversal of 21202022091 is 19022020212.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21202022091 - 2¹¹ = 21202020043 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21202022071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75184335 + ... + 75184616.

It is an arithmetic number, because the mean of its divisors is an integer number (3608854848).

Almost surely, 2^21202022091 is an apocalyptic number.

21202022091 is a deficient number, since it is larger than the sum of its proper divisors (7668816693).

21202022091 is a wasteful number, since it uses less digits than its factorization.

21202022091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150369001.

The product of its (nonzero) digits is 288, while the sum is 21.

The spelling of 21202022091 in words is "twenty-one billion, two hundred two million, twenty-two thousand, ninety-one".