121211110102 has 4 divisors (see below), whose sum is σ = 181816665156. Its totient is φ = 60605555050.

The previous prime is 121211110073. The next prime is 121211110129. The reversal of 121211110102 is 201011112121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 201011112121 = 8837 ⋅22746533.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30302777524 + ... + 30302777527.

It is an arithmetic number, because the mean of its divisors is an integer number (45454166289).

Almost surely, 2^121211110102 is an apocalyptic number.

121211110102 is a deficient number, since it is larger than the sum of its proper divisors (60605555054).

121211110102 is an equidigital number, since it uses as much as digits as its factorization.

121211110102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60605555053.

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

Adding to 121211110102 its reverse (201011112121), we get a palindrome (322222222223).

The spelling of 121211110102 in words is "one hundred twenty-one billion, two hundred eleven million, one hundred ten thousand, one hundred two".