1222136520 has 128 divisors (see below), whose sum is σ = 4012416000. Its totient is φ = 295335680.

The previous prime is 1222136507. The next prime is 1222136543. The reversal of 1222136520 is 256312221.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 472591 + ... + 475169.

It is an arithmetic number, because the mean of its divisors is an integer number (31347000).

Almost surely, 2^1222136520 is an apocalyptic number.

1222136520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1222136520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2006208000).

1222136520 is an abundant number, since it is smaller than the sum of its proper divisors (2790279480).

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

1222136520 is a wasteful number, since it uses less digits than its factorization.

1222136520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2963 (or 2959 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 1222136520 is about 34959.0692095771. The cubic root of 1222136520 is about 1069.1531191581.

Adding to 1222136520 its reverse (256312221), we get a palindrome (1478448741).

The spelling of 1222136520 in words is "one billion, two hundred twenty-two million, one hundred thirty-six thousand, five hundred twenty".