1522100221220 has 24 divisors (see below), whose sum is σ = 3228058097208. Its totient is φ = 602811968000.

The previous prime is 1522100221207. The next prime is 1522100221231. The reversal of 1522100221220 is 221220012251.

It can be written as a sum of positive squares in 4 ways, for example, as 836771221504 + 685328999716 = 914752^2 + 827846^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1522100221192 and 1522100221201.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 376755461 + ... + 376759500.

It is an arithmetic number, because the mean of its divisors is an integer number (134502420717).

Almost surely, 2^{1522100221220} is an apocalyptic number.

1522100221220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1522100221220 is an abundant number, since it is smaller than the sum of its proper divisors (1705957875988).

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

1522100221220 is a wasteful number, since it uses less digits than its factorization.

1522100221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 753515071 (or 753515069 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 20.

Adding to 1522100221220 its reverse (221220012251), we get a palindrome (1743320233471).

The spelling of 1522100221220 in words is "one trillion, five hundred twenty-two billion, one hundred million, two hundred twenty-one thousand, two hundred twenty".