1522621220 has 48 divisors (see below), whose sum is σ = 3321259200. Its totient is φ = 585648000.

The previous prime is 1522621213. The next prime is 1522621283. The reversal of 1522621220 is 221262251.

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, 140351 + ... + 150809.

It is an arithmetic number, because the mean of its divisors is an integer number (69192900).

Almost surely, 2^1522621220 is an apocalyptic number.

1522621220 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 1522621220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1660629600).

1522621220 is an abundant number, since it is smaller than the sum of its proper divisors (1798637980).

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

1522621220 is a wasteful number, since it uses less digits than its factorization.

1522621220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10748 (or 10746 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 1522621220 is about 39020.7793361435. The cubic root of 1522621220 is about 1150.4399627241.

Adding to 1522621220 its reverse (221262251), we get a palindrome (1743883471).

The spelling of 1522621220 in words is "one billion, five hundred twenty-two million, six hundred twenty-one thousand, two hundred twenty".