121221312330 has 32 divisors (see below), whose sum is σ = 306243316800. Its totient is φ = 30624331392.

The previous prime is 121221312307. The next prime is 121221312353. The reversal of 121221312330 is 33213122121.

It is an interprime number because it is at equal distance from previous prime (121221312307) and next prime (121221312353).

It is a junction number, because it is equal to n+sod(n) for n = 121221312297 and 121221312306.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106333915 + ... + 106335054.

It is an arithmetic number, because the mean of its divisors is an integer number (9570103650).

Almost surely, 2^121221312330 is an apocalyptic number.

121221312330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121221312330 is an abundant number, since it is smaller than the sum of its proper divisors (185022004470).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121221312330 is a wasteful number, since it uses less digits than its factorization.

121221312330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212668998.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 121221312330 its reverse (33213122121), we get a palindrome (154434434451).

The spelling of 121221312330 in words is "one hundred twenty-one billion, two hundred twenty-one million, three hundred twelve thousand, three hundred thirty".