100400021012 has 6 divisors (see below), whose sum is σ = 175700036778. Its totient is φ = 50200010504.

The previous prime is 100400021003. The next prime is 100400021017. The reversal of 100400021012 is 210120004001.

It can be written as a sum of positive squares in only one way, i.e., 87523672336 + 12876348676 = 295844^2 + 113474^2 .

It is a junction number, because it is equal to n+sod(n) for n = 100400020984 and 100400021002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100400021017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12550002623 + ... + 12550002630.

It is an arithmetic number, because the mean of its divisors is an integer number (29283339463).

Almost surely, 2^100400021012 is an apocalyptic number.

It is an amenable number.

100400021012 is a deficient number, since it is larger than the sum of its proper divisors (75300015766).

100400021012 is a wasteful number, since it uses less digits than its factorization.

100400021012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25100005257 (or 25100005255 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 100400021012 its reverse (210120004001), we get a palindrome (310520025013).

The spelling of 100400021012 in words is "one hundred billion, four hundred million, twenty-one thousand, twelve".