21022002331 has 4 divisors (see below), whose sum is σ = 22933093464. Its totient is φ = 19110911200.

The previous prime is 21022002319. The next prime is 21022002377. The reversal of 21022002331 is 13320022012.

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

It is a cyclic number.

It is not a de Polignac number, because 21022002331 - 2¹¹ = 21022000283 is a prime.

It is a super-2 number, since 2×21022002331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21022000331) 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, 955545550 + ... + 955545571.

It is an arithmetic number, because the mean of its divisors is an integer number (5733273366).

Almost surely, 2^21022002331 is an apocalyptic number.

21022002331 is a deficient number, since it is larger than the sum of its proper divisors (1911091133).

21022002331 is a wasteful number, since it uses less digits than its factorization.

21022002331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1911091132.

The product of its (nonzero) digits is 144, while the sum is 16.

Adding to 21022002331 its reverse (13320022012), we get a palindrome (34342024343).

The spelling of 21022002331 in words is "twenty-one billion, twenty-two million, two thousand, three hundred thirty-one".