981021220236 has 48 divisors (see below), whose sum is σ = 2653970457600. Its totient is φ = 312789373776.

The previous prime is 981021220051. The next prime is 981021220237. The reversal of 981021220236 is 632022120189.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 981021220236.

It is not an unprimeable number, because it can be changed into a prime (981021220237) 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, 197465556 + ... + 197470523.

It is an arithmetic number, because the mean of its divisors is an integer number (55291051200).

Almost surely, 2^981021220236 is an apocalyptic number.

It is an amenable number.

981021220236 is an abundant number, since it is smaller than the sum of its proper divisors (1672949237364).

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

981021220236 is a wasteful number, since it uses less digits than its factorization.

981021220236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394936115 (or 394936107 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The spelling of 981021220236 in words is "nine hundred eighty-one billion, twenty-one million, two hundred twenty thousand, two hundred thirty-six".