21435122 has 4 divisors (see below), whose sum is σ = 32152686. Its totient is φ = 10717560.

The previous prime is 21435107. The next prime is 21435133. The reversal of 21435122 is 22153412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 13756681 + 7678441 = 3709^2 + 2771^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21435094 and 21435103.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5358779 + ... + 5358782.

Almost surely, 2^21435122 is an apocalyptic number.

21435122 is a deficient number, since it is larger than the sum of its proper divisors (10717564).

21435122 is a wasteful number, since it uses less digits than its factorization.

21435122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10717563.

The product of its digits is 480, while the sum is 20.

The square root of 21435122 is about 4629.8079873792. The cubic root of 21435122 is about 277.7849120420.

Adding to 21435122 its reverse (22153412), we get a palindrome (43588534).

The spelling of 21435122 in words is "twenty-one million, four hundred thirty-five thousand, one hundred twenty-two".