20201001221111 has 4 divisors (see below), whose sum is σ = 20852646421824. Its totient is φ = 19549356020400.

The previous prime is 20201001221101. The next prime is 20201001221119. The reversal of 20201001221111 is 11112210010202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20201001221111 - 2²² = 20200997026807 is a prime.

It is a super-2 number, since 2×20201001221111² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20201001221119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 325822600310 + ... + 325822600371.

It is an arithmetic number, because the mean of its divisors is an integer number (5213161605456).

Almost surely, 2^{20201001221111} is an apocalyptic number.

20201001221111 is a deficient number, since it is larger than the sum of its proper divisors (651645200713).

20201001221111 is an equidigital number, since it uses as much as digits as its factorization.

20201001221111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 651645200712.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 20201001221111 its reverse (11112210010202), we get a palindrome (31313211231313).

The spelling of 20201001221111 in words is "twenty trillion, two hundred one billion, one million, two hundred twenty-one thousand, one hundred eleven".