21420010322 has 4 divisors (see below), whose sum is σ = 32130015486. Its totient is φ = 10710005160.

The previous prime is 21420010321. The next prime is 21420010369. The reversal of 21420010322 is 22301002412.

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., 17705229721 + 3714780601 = 133061^2 + 60949^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21420010322.

It is not an unprimeable number, because it can be changed into a prime (21420010321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5355002579 + ... + 5355002582.

Almost surely, 2^21420010322 is an apocalyptic number.

21420010322 is a deficient number, since it is larger than the sum of its proper divisors (10710005164).

21420010322 is a wasteful number, since it uses less digits than its factorization.

21420010322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10710005163.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21420010322 its reverse (22301002412), we get a palindrome (43721012734).

The spelling of 21420010322 in words is "twenty-one billion, four hundred twenty million, ten thousand, three hundred twenty-two".