121021012111 has 4 divisors (see below), whose sum is σ = 121763472472. Its totient is φ = 120278551752.

The previous prime is 121021012103. The next prime is 121021012141. The reversal of 121021012111 is 111210120121.

It is a happy number.

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 121021012111 - 2³ = 121021012103 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121021012091 and 121021012100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121021012141) 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, 371229936 + ... + 371230261.

It is an arithmetic number, because the mean of its divisors is an integer number (30440868118).

Almost surely, 2^121021012111 is an apocalyptic number.

121021012111 is a deficient number, since it is larger than the sum of its proper divisors (742460361).

121021012111 is an equidigital number, since it uses as much as digits as its factorization.

121021012111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 742460360.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 121021012111 its reverse (111210120121), we get a palindrome (232231132232).

The spelling of 121021012111 in words is "one hundred twenty-one billion, twenty-one million, twelve thousand, one hundred eleven".