20102111121 has 8 divisors (see below), whose sum is σ = 26813533120. Its totient is φ = 13396048272.

The previous prime is 20102111111. The next prime is 20102111129. The reversal of 20102111121 is 12111120102.

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

It is a de Polignac number, because none of the positive numbers 2^k-20102111121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20102111097 and 20102111106.

It is not an unprimeable number, because it can be changed into a prime (20102111129) 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, 1331026 + ... + 1346043.

It is an arithmetic number, because the mean of its divisors is an integer number (3351691640).

Almost surely, 2^20102111121 is an apocalyptic number.

It is an amenable number.

20102111121 is a deficient number, since it is larger than the sum of its proper divisors (6711421999).

20102111121 is a wasteful number, since it uses less digits than its factorization.

20102111121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2679575.

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

Adding to 20102111121 its reverse (12111120102), we get a palindrome (32213231223).

The spelling of 20102111121 in words is "twenty billion, one hundred two million, one hundred eleven thousand, one hundred twenty-one".