1210201000020 has 96 divisors (see below), whose sum is σ = 3810432205440. Its totient is φ = 318832058880.

The previous prime is 1210200999979. The next prime is 1210201000051. The reversal of 1210201000020 is 200001020121.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 1210200999966 and 1210201000011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13455861 + ... + 13545500.

It is an arithmetic number, because the mean of its divisors is an integer number (39692002140).

Almost surely, 2^{1210201000020} is an apocalyptic number.

1210201000020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1210201000020 is an abundant number, since it is smaller than the sum of its proper divisors (2600231205420).

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

1210201000020 is a wasteful number, since it uses less digits than its factorization.

1210201000020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27001462 (or 27001454 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 1210201000020 its reverse (200001020121), we get a palindrome (1410202020141).

The spelling of 1210201000020 in words is "one trillion, two hundred ten billion, two hundred one million, twenty", and thus it is an aban number.