20000101111221 has 16 divisors (see below), whose sum is σ = 33246921328128. Its totient is φ = 10389662914800.

The previous prime is 20000101111187. The next prime is 20000101111231. The reversal of 20000101111221 is 12211110100002.

It is not a de Polignac number, because 20000101111221 - 2²¹ = 20000099014069 is a prime.

It is a super-2 number, since 2×20000101111221² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20000101111197 and 20000101111206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20000101111231) 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, 43290261915 + ... + 43290262376.

It is an arithmetic number, because the mean of its divisors is an integer number (2077932583008).

Almost surely, 2^{20000101111221} is an apocalyptic number.

20000101111221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20000101111221 is a deficient number, since it is larger than the sum of its proper divisors (13246820216907).

20000101111221 is a wasteful number, since it uses less digits than its factorization.

20000101111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86580524312.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 20000101111221 its reverse (12211110100002), we get a palindrome (32211211211223).

The spelling of 20000101111221 in words is "twenty trillion, one hundred one million, one hundred eleven thousand, two hundred twenty-one".