21033242984 has 16 divisors (see below), whose sum is σ = 42470971620. Its totient is φ = 9707650560.

The previous prime is 21033242983. The next prime is 21033243001. The reversal of 21033242984 is 48924233012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 17712948100 + 3320294884 = 133090^2 + 57622^2 .

It is not an unprimeable number, because it can be changed into a prime (21033242983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101121257 + ... + 101121464.

Almost surely, 2^21033242984 is an apocalyptic number.

It is an amenable number.

21033242984 is an abundant number, since it is smaller than the sum of its proper divisors (21437728636).

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

21033242984 is a wasteful number, since it uses less digits than its factorization.

21033242984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202242740 (or 202242736 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 38.

Adding to 21033242984 its reverse (48924233012), we get a palindrome (69957475996).

The spelling of 21033242984 in words is "twenty-one billion, thirty-three million, two hundred forty-two thousand, nine hundred eighty-four".