1212222240 has 96 divisors (see below), whose sum is σ = 4242792960. Its totient is φ = 323258112.

The previous prime is 1212222227. The next prime is 1212222251. The reversal of 1212222240 is 422222121.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 135984 + ... + 144623.

It is an arithmetic number, because the mean of its divisors is an integer number (44195760).

Almost surely, 2^1212222240 is an apocalyptic number.

1212222240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212222240 is an abundant number, since it is smaller than the sum of its proper divisors (3030570720).

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

1212222240 is a wasteful number, since it uses less digits than its factorization.

1212222240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280631 (or 280617 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 1212222240 is about 34816.9820633552. The cubic root of 1212222240 is about 1066.2541860001.

Adding to 1212222240 its reverse (422222121), we get a palindrome (1634444361).

The spelling of 1212222240 in words is "one billion, two hundred twelve million, two hundred twenty-two thousand, two hundred forty".