21134431140223 has 16 divisors (see below), whose sum is σ = 21951474806016. Its totient is φ = 20325941925120.

The previous prime is 21134431140211. The next prime is 21134431140239. The reversal of 21134431140223 is 32204113443112.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21134431140223 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21134431140293) 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, 12010261 + ... + 13657057.

It is an arithmetic number, because the mean of its divisors is an integer number (1371967175376).

Almost surely, 2^{21134431140223} is an apocalyptic number.

21134431140223 is a deficient number, since it is larger than the sum of its proper divisors (817043665793).

21134431140223 is a wasteful number, since it uses less digits than its factorization.

21134431140223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1649394.

The product of its (nonzero) digits is 13824, while the sum is 31.

Adding to 21134431140223 its reverse (32204113443112), we get a palindrome (53338544583335).

The spelling of 21134431140223 in words is "twenty-one trillion, one hundred thirty-four billion, four hundred thirty-one million, one hundred forty thousand, two hundred twenty-three".