21030221332 has 6 divisors (see below), whose sum is σ = 36802887338. Its totient is φ = 10515110664.

The previous prime is 21030221309. The next prime is 21030221341. The reversal of 21030221332 is 23312203012.

It can be written as a sum of positive squares in only one way, i.e., 16196634756 + 4833586576 = 127266^2 + 69524^2 .

It is a super-3 number, since 3×21030221332³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2628777663 + ... + 2628777670.

Almost surely, 2^21030221332 is an apocalyptic number.

It is an amenable number.

21030221332 is a deficient number, since it is larger than the sum of its proper divisors (15772666006).

21030221332 is a wasteful number, since it uses less digits than its factorization.

21030221332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5257555337 (or 5257555335 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21030221332 its reverse (23312203012), we get a palindrome (44342424344).

The spelling of 21030221332 in words is "twenty-one billion, thirty million, two hundred twenty-one thousand, three hundred thirty-two".