21201322402 has 64 divisors (see below), whose sum is σ = 35627526144. Its totient is φ = 9400250880.

The previous prime is 21201322399. The next prime is 21201322409. The reversal of 21201322402 is 20422310212.

It is a super-3 number, since 3×21201322402³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21201322402.

It is not an unprimeable number, because it can be changed into a prime (21201322409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24174388 + ... + 24175264.

It is an arithmetic number, because the mean of its divisors is an integer number (556680096).

Almost surely, 2^21201322402 is an apocalyptic number.

21201322402 is a deficient number, since it is larger than the sum of its proper divisors (14426203742).

21201322402 is a wasteful number, since it uses less digits than its factorization.

21201322402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1283.

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21201322402 its reverse (20422310212), we get a palindrome (41623632614).

The spelling of 21201322402 in words is "twenty-one billion, two hundred one million, three hundred twenty-two thousand, four hundred two".