20121003100 has 36 divisors (see below), whose sum is σ = 47631904488. Its totient is φ = 7316728000.

The previous prime is 20121003013. The next prime is 20121003139. The reversal of 20121003100 is 130012102.

It is a super-2 number, since 2×20121003100² (a number of 21 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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9144811 + ... + 9147010.

It is an arithmetic number, because the mean of its divisors is an integer number (1323108458).

Almost surely, 2^20121003100 is an apocalyptic number.

20121003100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20121003100 is an abundant number, since it is smaller than the sum of its proper divisors (27510901388).

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

20121003100 is a wasteful number, since it uses less digits than its factorization.

20121003100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18291846 (or 18291839 counting only the distinct ones).

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

Adding to 20121003100 its reverse (130012102), we get a palindrome (20251015202).

The spelling of 20121003100 in words is "twenty billion, one hundred twenty-one million, three thousand, one hundred".