21011222032 has 10 divisors (see below), whose sum is σ = 40709242718. Its totient is φ = 10505611008.

The previous prime is 21011221997. The next prime is 21011222047. The reversal of 21011222032 is 23022211012.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17055315216 + 3955906816 = 130596^2 + 62896^2 .

It is a Harshad number since it is a multiple of its sum of digits (16), and also a Moran number because the ratio is a prime number: 1313201377 = 21011222032 / (2 + 1 + 0 + 1 + 1 + 2 + 2 + 2 + 0 + 3 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 21011221997 and 21011222015.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656600673 + ... + 656600704.

Almost surely, 2^21011222032 is an apocalyptic number.

It is an amenable number.

21011222032 is a deficient number, since it is larger than the sum of its proper divisors (19698020686).

21011222032 is a wasteful number, since it uses less digits than its factorization.

21011222032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1313201385 (or 1313201379 counting only the distinct ones).

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

Adding to 21011222032 its reverse (23022211012), we get a palindrome (44033433044).

The spelling of 21011222032 in words is "twenty-one billion, eleven million, two hundred twenty-two thousand, thirty-two".