2221202001220 has 24 divisors (see below), whose sum is σ = 4664713171608. Its totient is φ = 888444806400.

The previous prime is 2221202001217. The next prime is 2221202001257. The reversal of 2221202001220 is 221002021222.

It can be written as a sum of positive squares in 4 ways, for example, as 292975377984 + 1928226623236 = 541272^2 + 1388606^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2221202001194 and 2221202001203.

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, 1740801 + ... + 2733640.

It is an arithmetic number, because the mean of its divisors is an integer number (194363048817).

Almost surely, 2^{2221202001220} is an apocalyptic number.

2221202001220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2221202001220 is an abundant number, since it is smaller than the sum of its proper divisors (2443511170388).

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

2221202001220 is a wasteful number, since it uses less digits than its factorization.

2221202001220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4499271 (or 4499269 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 2221202001220 its reverse (221002021222), we get a palindrome (2442204022442).

The spelling of 2221202001220 in words is "two trillion, two hundred twenty-one billion, two hundred two million, one thousand, two hundred twenty".