21312000032123 has 16 divisors (see below), whose sum is σ = 22599204925440. Its totient is φ = 20041885987200.

The previous prime is 21312000032119. The next prime is 21312000032129. The reversal of 21312000032123 is 32123000021312.

It is a cyclic number.

It is not a de Polignac number, because 21312000032123 - 2² = 21312000032119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21312000032095 and 21312000032104.

It is not an unprimeable number, because it can be changed into a prime (21312000032129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6058715 + ... + 8906852.

It is an arithmetic number, because the mean of its divisors is an integer number (1412450307840).

Almost surely, 2^{21312000032123} is an apocalyptic number.

21312000032123 is a deficient number, since it is larger than the sum of its proper divisors (1287204893317).

21312000032123 is a wasteful number, since it uses less digits than its factorization.

21312000032123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14966138.

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

Adding to 21312000032123 its reverse (32123000021312), we get a palindrome (53435000053435).

The spelling of 21312000032123 in words is "twenty-one trillion, three hundred twelve billion, thirty-two thousand, one hundred twenty-three".