20211202091 has 8 divisors (see below), whose sum is σ = 21770271744. Its totient is φ = 18708825960.

The previous prime is 20211202057. The next prime is 20211202093. The reversal of 20211202091 is 19020211202.

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 20211202091 - 2³⁴ = 3031332907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20211202093) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14172641 + ... + 14174066.

It is an arithmetic number, because the mean of its divisors is an integer number (2721283968).

Almost surely, 2^20211202091 is an apocalyptic number.

20211202091 is a deficient number, since it is larger than the sum of its proper divisors (1559069653).

20211202091 is a wasteful number, since it uses less digits than its factorization.

20211202091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28346761.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 20211202091 its reverse (19020211202), we get a palindrome (39231413293).

The spelling of 20211202091 in words is "twenty billion, two hundred eleven million, two hundred two thousand, ninety-one".