21203453662 has 8 divisors (see below), whose sum is σ = 31805801496. Its totient is φ = 10601519832.

The previous prime is 21203453659. The next prime is 21203453669. The reversal of 21203453662 is 26635430212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21203453669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128968 + ... + 242980.

It is an arithmetic number, because the mean of its divisors is an integer number (3975725187).

Almost surely, 2^21203453662 is an apocalyptic number.

21203453662 is a deficient number, since it is larger than the sum of its proper divisors (10602347834).

21203453662 is a wasteful number, since it uses less digits than its factorization.

21203453662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207002.

The product of its (nonzero) digits is 51840, while the sum is 34.

Adding to 21203453662 its reverse (26635430212), we get a palindrome (47838883874).

The spelling of 21203453662 in words is "twenty-one billion, two hundred three million, four hundred fifty-three thousand, six hundred sixty-two".