21032222231 has 4 divisors (see below), whose sum is σ = 22269411792. Its totient is φ = 19795032672.

The previous prime is 21032222227. The next prime is 21032222249. The reversal of 21032222231 is 13222223012.

It is a happy number.

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 21032222231 - 2² = 21032222227 is a prime.

It is a super-2 number, since 2×21032222231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21032252231) 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, 618594755 + ... + 618594788.

It is an arithmetic number, because the mean of its divisors is an integer number (5567352948).

Almost surely, 2^21032222231 is an apocalyptic number.

21032222231 is a deficient number, since it is larger than the sum of its proper divisors (1237189561).

21032222231 is a wasteful number, since it uses less digits than its factorization.

21032222231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1237189560.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21032222231 its reverse (13222223012), we get a palindrome (34254445243).

The spelling of 21032222231 in words is "twenty-one billion, thirty-two million, two hundred twenty-two thousand, two hundred thirty-one".