21420310122 has 24 divisors (see below), whose sum is σ = 46414944576. Its totient is φ = 7139446056.

The previous prime is 21420310103. The next prime is 21420310129. The reversal of 21420310122 is 22101302412.

It is a happy number.

21420310122 is a `hidden beast` number, since 214 + 20 + 310 + 122 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21420310095 and 21420310104.

It is not an unprimeable number, because it can be changed into a prime (21420310129) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 171423 + ... + 268749.

It is an arithmetic number, because the mean of its divisors is an integer number (1933956024).

Almost surely, 2^21420310122 is an apocalyptic number.

21420310122 is an abundant number, since it is smaller than the sum of its proper divisors (24994634454).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21420310122 is a wasteful number, since it uses less digits than its factorization.

21420310122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109562 (or 109559 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21420310122 its reverse (22101302412), we get a palindrome (43521612534).

The spelling of 21420310122 in words is "twenty-one billion, four hundred twenty million, three hundred ten thousand, one hundred twenty-two".