21221230232 has 32 divisors (see below), whose sum is σ = 42088589280. Its totient is φ = 10010246400.

The previous prime is 21221230189. The next prime is 21221230243. The reversal of 21221230232 is 23203212212.

It is a happy number.

It is a super-2 number, since 2×21221230232² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 776519 + ... + 803382.

It is an arithmetic number, because the mean of its divisors is an integer number (1315268415).

Almost surely, 2^21221230232 is an apocalyptic number.

It is an amenable number.

21221230232 is a deficient number, since it is larger than the sum of its proper divisors (20867359048).

21221230232 is a wasteful number, since it uses less digits than its factorization.

21221230232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1580003 (or 1579999 counting only the distinct ones).

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

Adding to 21221230232 its reverse (23203212212), we get a palindrome (44424442444).

The spelling of 21221230232 in words is "twenty-one billion, two hundred twenty-one million, two hundred thirty thousand, two hundred thirty-two".