1001201012100 has 108 divisors (see below), whose sum is σ = 3138523691940. Its totient is φ = 266960160000.

The previous prime is 1001201012083. The next prime is 1001201012153. The reversal of 1001201012100 is 12101021001.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 289459064196 + 711741947904 = 538014^2 + 843648^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 9911850 + ... + 10012350.

It is an arithmetic number, because the mean of its divisors is an integer number (29060404555).

Almost surely, 2^{1001201012100} is an apocalyptic number.

1001201012100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1001201012100 is an abundant number, since it is smaller than the sum of its proper divisors (2137322679840).

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

1001201012100 is a wasteful number, since it uses less digits than its factorization.

1001201012100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111590 (or 111580 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 1001201012100 its reverse (12101021001), we get a palindrome (1013302033101).

The spelling of 1001201012100 in words is "one trillion, one billion, two hundred one million, twelve thousand, one hundred".