121120021245 has 32 divisors (see below), whose sum is σ = 195088564224. Its totient is φ = 64165608000.

The previous prime is 121120021241. The next prime is 121120021249. The reversal of 121120021245 is 542120021121.

It is an interprime number because it is at equal distance from previous prime (121120021241) and next prime (121120021249).

It is not a de Polignac number, because 121120021245 - 2² = 121120021241 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121120021241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4757500 + ... + 4782890.

It is an arithmetic number, because the mean of its divisors is an integer number (6096517632).

Almost surely, 2^121120021245 is an apocalyptic number.

121120021245 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121120021245 is a deficient number, since it is larger than the sum of its proper divisors (73968542979).

121120021245 is a wasteful number, since it uses less digits than its factorization.

121120021245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27513.

The product of its (nonzero) digits is 320, while the sum is 21.

Adding to 121120021245 its reverse (542120021121), we get a palindrome (663240042366).

The spelling of 121120021245 in words is "one hundred twenty-one billion, one hundred twenty million, twenty-one thousand, two hundred forty-five".