21350051223 has 32 divisors (see below), whose sum is σ = 29425628160. Its totient is φ = 13762022400.

The previous prime is 21350051213. The next prime is 21350051251. The reversal of 21350051223 is 32215005312.

It is a happy number.

It is not a de Polignac number, because 21350051223 - 2²² = 21345856919 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21350051193 and 21350051202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21350051213) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6048123 + ... + 6051651.

It is an arithmetic number, because the mean of its divisors is an integer number (919550880).

Almost surely, 2^21350051223 is an apocalyptic number.

21350051223 is a deficient number, since it is larger than the sum of its proper divisors (8075576937).

21350051223 is a wasteful number, since it uses less digits than its factorization.

21350051223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4087.

The product of its (nonzero) digits is 1800, while the sum is 24.

Adding to 21350051223 its reverse (32215005312), we get a palindrome (53565056535).

The spelling of 21350051223 in words is "twenty-one billion, three hundred fifty million, fifty-one thousand, two hundred twenty-three".