121212110990 has 32 divisors (see below), whose sum is σ = 219899455776. Its totient is φ = 48103319680.

The previous prime is 121212110989. The next prime is 121212110993. The reversal of 121212110990 is 99011212121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121212110993) 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, 7449704 + ... + 7465956.

It is an arithmetic number, because the mean of its divisors is an integer number (6871857993).

Almost surely, 2^121212110990 is an apocalyptic number.

121212110990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121212110990 is a deficient number, since it is larger than the sum of its proper divisors (98687344786).

121212110990 is a wasteful number, since it uses less digits than its factorization.

121212110990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22084.

The product of its (nonzero) digits is 648, while the sum is 29.

The spelling of 121212110990 in words is "one hundred twenty-one billion, two hundred twelve million, one hundred ten thousand, nine hundred ninety".