21012230122 has 16 divisors (see below), whose sum is σ = 34665023232. Its totient is φ = 9491612400.

The previous prime is 21012230069. The next prime is 21012230123. The reversal of 21012230122 is 22103221012.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21012230096 and 21012230105.

It is not an unprimeable number, because it can be changed into a prime (21012230123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8596254 + ... + 8598697.

It is an arithmetic number, because the mean of its divisors is an integer number (2166563952).

Almost surely, 2^21012230122 is an apocalyptic number.

21012230122 is a deficient number, since it is larger than the sum of its proper divisors (13652793110).

21012230122 is a wasteful number, since it uses less digits than its factorization.

21012230122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17195013.

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

Adding to 21012230122 its reverse (22103221012), we get a palindrome (43115451134).

The spelling of 21012230122 in words is "twenty-one billion, twelve million, two hundred thirty thousand, one hundred twenty-two".