121213730 has 64 divisors (see below), whose sum is σ = 255052800. Its totient is φ = 41008320.

The previous prime is 121213727. The next prime is 121213733. The reversal of 121213730 is 37312121.

It is an interprime number because it is at equal distance from previous prime (121213727) and next prime (121213733).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (121213733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 122819 + ... + 123801.

It is an arithmetic number, because the mean of its divisors is an integer number (3985200).

Almost surely, 2^121213730 is an apocalyptic number.

121213730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121213730 is an abundant number, since it is smaller than the sum of its proper divisors (133839070).

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

121213730 is a wasteful number, since it uses less digits than its factorization.

121213730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1079.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 121213730 is about 11009.7107137290. The cubic root of 121213730 is about 494.8997926597.

Adding to 121213730 its reverse (37312121), we get a palindrome (158525851).

It can be divided in two parts, 12121 and 3730, that added together give a palindrome (15851).

The spelling of 121213730 in words is "one hundred twenty-one million, two hundred thirteen thousand, seven hundred thirty".