21202111321 has 8 divisors (see below), whose sum is σ = 22498925760. Its totient is φ = 19936545552.

The previous prime is 21202111303. The next prime is 21202111339. The reversal of 21202111321 is 12311120212.

It is an interprime number because it is at equal distance from previous prime (21202111303) and next prime (21202111339).

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

It is a cyclic number.

It is not a de Polignac number, because 21202111321 - 2¹¹ = 21202109273 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21202111295 and 21202111304.

It is not an unprimeable number, because it can be changed into a prime (21202141321) 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, 7810770 + ... + 7813483.

It is an arithmetic number, because the mean of its divisors is an integer number (2812365720).

Almost surely, 2^21202111321 is an apocalyptic number.

It is an amenable number.

21202111321 is a deficient number, since it is larger than the sum of its proper divisors (1296814439).

21202111321 is a wasteful number, since it uses less digits than its factorization.

21202111321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15624335.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21202111321 its reverse (12311120212), we get a palindrome (33513231533).

The spelling of 21202111321 in words is "twenty-one billion, two hundred two million, one hundred eleven thousand, three hundred twenty-one".