20211000221191 has 16 divisors (see below), whose sum is σ = 21776590080000. Its totient is φ = 18646968513888.

The previous prime is 20211000221183. The next prime is 20211000221207. The reversal of 20211000221191 is 19112200011202.

It is not a de Polignac number, because 20211000221191 - 2³ = 20211000221183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211000221891) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 552209910 + ... + 552246508.

It is an arithmetic number, because the mean of its divisors is an integer number (1361036880000).

Almost surely, 2^{20211000221191} is an apocalyptic number.

20211000221191 is a deficient number, since it is larger than the sum of its proper divisors (1565589858809).

20211000221191 is a wasteful number, since it uses less digits than its factorization.

20211000221191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56718.

The product of its (nonzero) digits is 144, while the sum is 22.

Adding to 20211000221191 its reverse (19112200011202), we get a palindrome (39323200232393).

The spelling of 20211000221191 in words is "twenty trillion, two hundred eleven billion, two hundred twenty-one thousand, one hundred ninety-one".