21100012130 has 16 divisors (see below), whose sum is σ = 37986193080. Its totient is φ = 8438633472.

The previous prime is 21100012103. The next prime is 21100012147. The reversal of 21100012130 is 3121000112.

It can be written as a sum of positive squares in 4 ways, for example, as 14213169961 + 6886842169 = 119219^2 + 82987^2 .

It is a super-2 number, since 2×21100012130² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105599 + ... + 230978.

Almost surely, 2^21100012130 is an apocalyptic number.

21100012130 is a deficient number, since it is larger than the sum of its proper divisors (16886180950).

21100012130 is a wasteful number, since it uses less digits than its factorization.

21100012130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342853.

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 21100012130 its reverse (3121000112), we get a palindrome (24221012242).

The spelling of 21100012130 in words is "twenty-one billion, one hundred million, twelve thousand, one hundred thirty".