1225101720 has 64 divisors (see below), whose sum is σ = 3711731040. Its totient is φ = 323456000.

The previous prime is 1225101707. The next prime is 1225101727. The reversal of 1225101720 is 271015221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225101727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38421 + ... + 62660.

Almost surely, 2^1225101720 is an apocalyptic number.

1225101720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1225101720 is an abundant number, since it is smaller than the sum of its proper divisors (2486629320).

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

1225101720 is a wasteful number, since it uses less digits than its factorization.

1225101720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101196 (or 101192 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 21.

The square root of 1225101720 is about 35001.4531126923. The cubic root of 1225101720 is about 1070.0170958342.

Adding to 1225101720 its reverse (271015221), we get a palindrome (1496116941).

The spelling of 1225101720 in words is "one billion, two hundred twenty-five million, one hundred one thousand, seven hundred twenty".