21211220032 has 28 divisors (see below), whose sum is σ = 42095649616. Its totient is φ = 10604442240.

The previous prime is 21211220021. The next prime is 21211220039. The reversal of 21211220032 is 23002211212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 21211219988 and 21211220015.

It is not an unprimeable number, because it can be changed into a prime (21211220039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1078963 + ... + 1098445.

Almost surely, 2^21211220032 is an apocalyptic number.

It is an amenable number.

21211220032 is a deficient number, since it is larger than the sum of its proper divisors (20884429584).

21211220032 is a wasteful number, since it uses less digits than its factorization.

21211220032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36506 (or 36496 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21211220032 its reverse (23002211212), we get a palindrome (44213431244).

The spelling of 21211220032 in words is "twenty-one billion, two hundred eleven million, two hundred twenty thousand, thirty-two".