21121031332 has 18 divisors (see below), whose sum is σ = 39009552918. Its totient is φ = 10004698368.

The previous prime is 21121031317. The next prime is 21121031341. The reversal of 21121031332 is 23313012112.

It can be written as a sum of positive squares in only one way, i.e., 18383021056 + 2738010276 = 135584^2 + 52326^2 .

It is a Harshad number since it is a multiple of its sum of digits (19).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7311933 + ... + 7314820.

Almost surely, 2^21121031332 is an apocalyptic number.

It is an amenable number.

21121031332 is a deficient number, since it is larger than the sum of its proper divisors (17888521586).

21121031332 is a wasteful number, since it uses less digits than its factorization.

21121031332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14626795 (or 14626774 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21121031332 its reverse (23313012112), we get a palindrome (44434043444).

The spelling of 21121031332 in words is "twenty-one billion, one hundred twenty-one million, thirty-one thousand, three hundred thirty-two".