21232212330 has 64 divisors (see below), whose sum is σ = 58362974208. Its totient is φ = 4842573120.

The previous prime is 21232212329. The next prime is 21232212343. The reversal of 21232212330 is 3321223212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 21232212297 and 21232212306.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11956 + ... + 206415.

It is an arithmetic number, because the mean of its divisors is an integer number (911921472).

Almost surely, 2^21232212330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21232212330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29181487104).

21232212330 is an abundant number, since it is smaller than the sum of its proper divisors (37130761878).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21232212330 is a wasteful number, since it uses less digits than its factorization.

21232212330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218851.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21232212330 its reverse (3321223212), we get a palindrome (24553435542).

The spelling of 21232212330 in words is "twenty-one billion, two hundred thirty-two million, two hundred twelve thousand, three hundred thirty".