1000002001220 has 24 divisors (see below), whose sum is σ = 2126586537600. Its totient is φ = 394937498592.

The previous prime is 1000002001133. The next prime is 1000002001231. The reversal of 1000002001220 is 221002000001.

It is a junction number, because it is equal to n+sod(n) for n = 1000002001198 and 1000002001207.

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, 316454750 + ... + 316457909.

It is an arithmetic number, because the mean of its divisors is an integer number (88607772400).

Almost surely, 2^{1000002001220} is an apocalyptic number.

1000002001220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1000002001220 is an abundant number, since it is smaller than the sum of its proper divisors (1126584536380).

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

1000002001220 is a wasteful number, since it uses less digits than its factorization.

1000002001220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632912747 (or 632912745 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 8.

Adding to 1000002001220 its reverse (221002000001), we get a palindrome (1221004001221).

The spelling of 1000002001220 in words is "one trillion, two million, one thousand, two hundred twenty".