1225122100 has 36 divisors (see below), whose sum is σ = 2660364448. Its totient is φ = 489708000.

The previous prime is 1225122097. The next prime is 1225122127. The reversal of 1225122100 is 12215221.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 179755 + ... + 186445.

Almost surely, 2^1225122100 is an apocalyptic number.

1225122100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1225122100 is an abundant number, since it is smaller than the sum of its proper divisors (1435242348).

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

1225122100 is a wasteful number, since it uses less digits than its factorization.

1225122100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8536 (or 8529 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 1225122100 is about 35001.7442422517. The cubic root of 1225122100 is about 1070.0230291722.

Adding to 1225122100 its reverse (12215221), we get a palindrome (1237337321).

The spelling of 1225122100 in words is "one billion, two hundred twenty-five million, one hundred twenty-two thousand, one hundred".