21202032311 has 4 divisors (see below), whose sum is σ = 21215310072. Its totient is φ = 21188754552.

The previous prime is 21202032301. The next prime is 21202032353. The reversal of 21202032311 is 11323020212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21202032311 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21202032311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202032301) 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, 6636485 + ... + 6639678.

It is an arithmetic number, because the mean of its divisors is an integer number (5303827518).

Almost surely, 2^21202032311 is an apocalyptic number.

21202032311 is a deficient number, since it is larger than the sum of its proper divisors (13277761).

21202032311 is a wasteful number, since it uses less digits than its factorization.

21202032311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13277760.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21202032311 its reverse (11323020212), we get a palindrome (32525052523).

The spelling of 21202032311 in words is "twenty-one billion, two hundred two million, thirty-two thousand, three hundred eleven".