21010200984 has 64 divisors (see below), whose sum is σ = 58397040000. Its totient is φ = 6999156000.

The previous prime is 21010200983. The next prime is 21010201013. The reversal of 21010200984 is 48900201012.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010200983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 338359 + ... + 395609.

It is an arithmetic number, because the mean of its divisors is an integer number (912453750).

Almost surely, 2^21010200984 is an apocalyptic number.

21010200984 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21010200984 is an abundant number, since it is smaller than the sum of its proper divisors (37386839016).

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

21010200984 is a wasteful number, since it uses less digits than its factorization.

21010200984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58965 (or 58955 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

Adding to 21010200984 its reverse (48900201012), we get a palindrome (69910401996).

The spelling of 21010200984 in words is "twenty-one billion, ten million, two hundred thousand, nine hundred eighty-four".