21123120134 has 16 divisors (see below), whose sum is σ = 31752142560. Its totient is φ = 10539096960.

The previous prime is 21123120131. The next prime is 21123120149. The reversal of 21123120134 is 43102132112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21123120131) 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, 2099087 + ... + 2109125.

It is an arithmetic number, because the mean of its divisors is an integer number (1984508910).

Almost surely, 2^21123120134 is an apocalyptic number.

21123120134 is a deficient number, since it is larger than the sum of its proper divisors (10629022426).

21123120134 is a wasteful number, since it uses less digits than its factorization.

21123120134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12175.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21123120134 its reverse (43102132112), we get a palindrome (64225252246).

The spelling of 21123120134 in words is "twenty-one billion, one hundred twenty-three million, one hundred twenty thousand, one hundred thirty-four".