1231000002100 has 36 divisors (see below), whose sum is σ = 2914112734848. Its totient is φ = 447636364000.

The previous prime is 1231000002091. The next prime is 1231000002137. The reversal of 1231000002100 is 12000001321.

It is a super-2 number, since 2×1231000002100² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 559544356 + ... + 559546555.

It is an arithmetic number, because the mean of its divisors is an integer number (80947575968).

Almost surely, 2^{1231000002100} is an apocalyptic number.

1231000002100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231000002100 is an abundant number, since it is smaller than the sum of its proper divisors (1683112732748).

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

1231000002100 is a wasteful number, since it uses less digits than its factorization.

1231000002100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1119090936 (or 1119090929 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

Adding to 1231000002100 its reverse (12000001321), we get a palindrome (1243000003421).

The spelling of 1231000002100 in words is "one trillion, two hundred thirty-one billion, two thousand, one hundred".