21050423122 has 8 divisors (see below), whose sum is σ = 31577685372. Its totient is φ = 10524528000.

The previous prime is 21050423099. The next prime is 21050423123. The reversal of 21050423122 is 22132405012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 20920440321 + 129982801 = 144639^2 + 11401^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21050423093 and 21050423102.

It is not an unprimeable number, because it can be changed into a prime (21050423123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 302379 + ... + 365422.

Almost surely, 2^21050423122 is an apocalyptic number.

21050423122 is a deficient number, since it is larger than the sum of its proper divisors (10527262250).

21050423122 is a wasteful number, since it uses less digits than its factorization.

21050423122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 683564.

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 21050423122 its reverse (22132405012), we get a palindrome (43182828134).

The spelling of 21050423122 in words is "twenty-one billion, fifty million, four hundred twenty-three thousand, one hundred twenty-two".