2221111222020 has 72 divisors (see below), whose sum is σ = 6738826198104. Its totient is φ = 592168370688.

The previous prime is 2221111222009. The next prime is 2221111222061. The reversal of 2221111222020 is 202221111222.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 301925376 + 2220809296644 = 17376^2 + 1490238^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 2221111221984 and 2221111222002.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 495889 + ... + 2165208.

It is an arithmetic number, because the mean of its divisors is an integer number (93594808307).

Almost surely, 2^{2221111222020} is an apocalyptic number.

2221111222020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2221111222020 is an abundant number, since it is smaller than the sum of its proper divisors (4517714976084).

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

2221111222020 is a wasteful number, since it uses less digits than its factorization.

2221111222020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2665749 (or 2665744 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 2221111222020 its reverse (202221111222), we get a palindrome (2423332333242).

The spelling of 2221111222020 in words is "two trillion, two hundred twenty-one billion, one hundred eleven million, two hundred twenty-two thousand, twenty".