21120420422 has 4 divisors (see below), whose sum is σ = 31680630636. Its totient is φ = 10560210210.

The previous prime is 21120420413. The next prime is 21120420499. The reversal of 21120420422 is 22402402112.

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

It is a junction number, because it is equal to n+sod(n) for n = 21120420394 and 21120420403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5280105104 + ... + 5280105107.

It is an arithmetic number, because the mean of its divisors is an integer number (7920157659).

Almost surely, 2^21120420422 is an apocalyptic number.

21120420422 is a deficient number, since it is larger than the sum of its proper divisors (10560210214).

21120420422 is a wasteful number, since it uses less digits than its factorization.

21120420422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10560210213.

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 21120420422 its reverse (22402402112), we get a palindrome (43522822534).

The spelling of 21120420422 in words is "twenty-one billion, one hundred twenty million, four hundred twenty thousand, four hundred twenty-two".