20002121121111 has 8 divisors (see below), whose sum is σ = 26671069525104. Its totient is φ = 13333960065600.

The previous prime is 20002121121097. The next prime is 20002121121133. The reversal of 20002121121111 is 11112112120002.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20002121121111 - 2⁹ = 20002121120599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20002121121211) 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, 196777840 + ... + 196879461.

It is an arithmetic number, because the mean of its divisors is an integer number (3333883690638).

Almost surely, 2^{20002121121111} is an apocalyptic number.

20002121121111 is a deficient number, since it is larger than the sum of its proper divisors (6668948403993).

20002121121111 is a wasteful number, since it uses less digits than its factorization.

20002121121111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393674241.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 20002121121111 its reverse (11112112120002), we get a palindrome (31114233241113).

The spelling of 20002121121111 in words is "twenty trillion, two billion, one hundred twenty-one million, one hundred twenty-one thousand, one hundred eleven".