1220002020021 has 16 divisors (see below), whose sum is σ = 1651375991808. Its totient is φ = 801065688000.

The previous prime is 1220002019993. The next prime is 1220002020037. The reversal of 1220002020021 is 1200202000221.

It is not a de Polignac number, because 1220002020021 - 2¹¹ = 1220002017973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1220002019979 and 1220002020006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220002020091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10482466 + ... + 10598211.

It is an arithmetic number, because the mean of its divisors is an integer number (103210999488).

Almost surely, 2^{1220002020021} is an apocalyptic number.

It is an amenable number.

1220002020021 is a deficient number, since it is larger than the sum of its proper divisors (431373971787).

1220002020021 is a wasteful number, since it uses less digits than its factorization.

1220002020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21080972.

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 1220002020021 its reverse (1200202000221), we get a palindrome (2420204020242).

The spelling of 1220002020021 in words is "one trillion, two hundred twenty billion, two million, twenty thousand, twenty-one".