21103120132 has 24 divisors (see below), whose sum is σ = 37855480320. Its totient is φ = 10288926720.

The previous prime is 21103120099. The next prime is 21103120133. The reversal of 21103120132 is 23102130112.

It is not an unprimeable number, because it can be changed into a prime (21103120133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 156157 + ... + 258052.

It is an arithmetic number, because the mean of its divisors is an integer number (1577311680).

Almost surely, 2^21103120132 is an apocalyptic number.

It is an amenable number.

21103120132 is a deficient number, since it is larger than the sum of its proper divisors (16752360188).

21103120132 is a wasteful number, since it uses less digits than its factorization.

21103120132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414531 (or 414529 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21103120132 its reverse (23102130112), we get a palindrome (44205250244).

The spelling of 21103120132 in words is "twenty-one billion, one hundred three million, one hundred twenty thousand, one hundred thirty-two".