1225121340 has 24 divisors (see below), whose sum is σ = 3430339920. Its totient is φ = 326699008.

The previous prime is 1225121281. The next prime is 1225121351. The reversal of 1225121340 is 431215221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10209285 + ... + 10209404.

It is an arithmetic number, because the mean of its divisors is an integer number (142930830).

Almost surely, 2^1225121340 is an apocalyptic number.

1225121340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1225121340 is an abundant number, since it is smaller than the sum of its proper divisors (2205218580).

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

1225121340 is a wasteful number, since it uses less digits than its factorization.

1225121340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20418701 (or 20418699 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 1225121340 is about 35001.7333856482. The cubic root of 1225121340 is about 1070.0228079105.

Adding to 1225121340 its reverse (431215221), we get a palindrome (1656336561).

The spelling of 1225121340 in words is "one billion, two hundred twenty-five million, one hundred twenty-one thousand, three hundred forty".