1212320121 has 8 divisors (see below), whose sum is σ = 1616926560. Its totient is φ = 807963552.

The previous prime is 1212320119. The next prime is 1212320129. The reversal of 1212320121 is 1210232121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1212320121 - 2¹ = 1212320119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1212320121.

It is not an unprimeable number, because it can be changed into a prime (1212320129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50836 + ... + 70773.

It is an arithmetic number, because the mean of its divisors is an integer number (202115820).

Almost surely, 2^1212320121 is an apocalyptic number.

It is an amenable number.

1212320121 is a deficient number, since it is larger than the sum of its proper divisors (404606439).

1212320121 is a wasteful number, since it uses less digits than its factorization.

1212320121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124935.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1212320121 is about 34818.3876852447. The cubic root of 1212320121 is about 1066.2828834930.

Adding to 1212320121 its reverse (1210232121), we get a palindrome (2422552242).

The spelling of 1212320121 in words is "one billion, two hundred twelve million, three hundred twenty thousand, one hundred twenty-one".