21203121299 has 8 divisors (see below), whose sum is σ = 21674412480. Its totient is φ = 20736383976.

The previous prime is 21203121271. The next prime is 21203121311. The reversal of 21203121299 is 99212130212.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21203121299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21203121239) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1129049 + ... + 1147674.

It is an arithmetic number, because the mean of its divisors is an integer number (2709301560).

Almost surely, 2^21203121299 is an apocalyptic number.

21203121299 is a deficient number, since it is larger than the sum of its proper divisors (471291181).

21203121299 is a wasteful number, since it uses less digits than its factorization.

21203121299 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2276929.

The product of its (nonzero) digits is 3888, while the sum is 32.

The spelling of 21203121299 in words is "twenty-one billion, two hundred three million, one hundred twenty-one thousand, two hundred ninety-nine".