21123134030 has 32 divisors (see below), whose sum is σ = 38860922880. Its totient is φ = 8264622240.

The previous prime is 21123134009. The next prime is 21123134069. The reversal of 21123134030 is 3043132112.

It is a junction number, because it is equal to n+sod(n) for n = 21123133993 and 21123134011.

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 15 ways as a sum of consecutive naturals, for example, 26960 + ... + 207299.

It is an arithmetic number, because the mean of its divisors is an integer number (1214403840).

Almost surely, 2^21123134030 is an apocalyptic number.

21123134030 is a deficient number, since it is larger than the sum of its proper divisors (17737788850).

21123134030 is a wasteful number, since it uses less digits than its factorization.

21123134030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234464.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21123134030 its reverse (3043132112), we get a palindrome (24166266142).

The spelling of 21123134030 in words is "twenty-one billion, one hundred twenty-three million, one hundred thirty-four thousand, thirty".