20012212191 has 8 divisors (see below), whose sum is σ = 26689624704. Its totient is φ = 13338137240.

The previous prime is 20012212151. The next prime is 20012212261. The reversal of 20012212191 is 19121221002.

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 20012212191 - 2¹⁴ = 20012195807 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20012212151) 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, 820365 + ... + 844406.

It is an arithmetic number, because the mean of its divisors is an integer number (3336203088).

Almost surely, 2^20012212191 is an apocalyptic number.

20012212191 is a deficient number, since it is larger than the sum of its proper divisors (6677412513).

20012212191 is a wasteful number, since it uses less digits than its factorization.

20012212191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1668781.

The product of its (nonzero) digits is 144, while the sum is 21.

Adding to 20012212191 its reverse (19121221002), we get a palindrome (39133433193).

The spelling of 20012212191 in words is "twenty billion, twelve million, two hundred twelve thousand, one hundred ninety-one".