121221340 has 12 divisors (see below), whose sum is σ = 254564856. Its totient is φ = 48488528.

The previous prime is 121221337. The next prime is 121221371. The reversal of 121221340 is 43122121.

It is a super-2 number, since 2×121221340² = 29389226542791200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3030514 + ... + 3030553.

It is an arithmetic number, because the mean of its divisors is an integer number (21213738).

Almost surely, 2^121221340 is an apocalyptic number.

121221340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121221340 is an abundant number, since it is smaller than the sum of its proper divisors (133343516).

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

121221340 is a wasteful number, since it uses less digits than its factorization.

121221340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6061076 (or 6061074 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 121221340 is about 11010.0563122992. The cubic root of 121221340 is about 494.9101493210.

Adding to 121221340 its reverse (43122121), we get a palindrome (164343461).

The spelling of 121221340 in words is "one hundred twenty-one million, two hundred twenty-one thousand, three hundred forty".