1220000021210 has 16 divisors (see below), whose sum is σ = 2325176511336. Its totient is φ = 459294125568.

The previous prime is 1220000021203. The next prime is 1220000021243. The reversal of 1220000021210 is 121200000221.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 825901081681 + 394098939529 = 908791^2 + 627773^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1220000021191 and 1220000021200.

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, 3588235187 + ... + 3588235526.

Almost surely, 2^{1220000021210} is an apocalyptic number.

1220000021210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1220000021210 is a deficient number, since it is larger than the sum of its proper divisors (1105176490126).

1220000021210 is a wasteful number, since it uses less digits than its factorization.

1220000021210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7176470737.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 1220000021210 its reverse (121200000221), we get a palindrome (1341200021431).

The spelling of 1220000021210 in words is "one trillion, two hundred twenty billion, twenty-one thousand, two hundred ten".