21012023122 has 8 divisors (see below), whose sum is σ = 31518699516. Its totient is φ = 10505789952.

The previous prime is 21012023119. The next prime is 21012023141. The reversal of 21012023122 is 22132021012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18757767681 + 2254255441 = 136959^2 + 47479^2 .

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 = 21012023096 and 21012023105.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60978 + ... + 213874.

Almost surely, 2^21012023122 is an apocalyptic number.

21012023122 is a deficient number, since it is larger than the sum of its proper divisors (10506676394).

21012023122 is a wasteful number, since it uses less digits than its factorization.

21012023122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221612.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21012023122 its reverse (22132021012), we get a palindrome (43144044134).

The spelling of 21012023122 in words is "twenty-one billion, twelve million, twenty-three thousand, one hundred twenty-two".