21201344402 has 48 divisors (see below), whose sum is σ = 39197517408. Its totient is φ = 8545864320.

The previous prime is 21201344393. The next prime is 21201344407. The reversal of 21201344402 is 20444310212.

It is not an unprimeable number, because it can be changed into a prime (21201344407) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3013613 + ... + 3020639.

It is an arithmetic number, because the mean of its divisors is an integer number (816614946).

Almost surely, 2^21201344402 is an apocalyptic number.

21201344402 is a deficient number, since it is larger than the sum of its proper divisors (17996173006).

21201344402 is a wasteful number, since it uses less digits than its factorization.

21201344402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8871 (or 8864 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 21201344402 its reverse (20444310212), we get a palindrome (41645654614).

The spelling of 21201344402 in words is "twenty-one billion, two hundred one million, three hundred forty-four thousand, four hundred two".