1081721000280 has 64 divisors (see below), whose sum is σ = 3245436142560. Its totient is φ = 288434654208.

The previous prime is 1081721000221. The next prime is 1081721000281. The reversal of 1081721000280 is 820001271801.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1081721000281) 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, 1075434 + ... + 1822086.

Almost surely, 2^{1081721000280} is an apocalyptic number.

1081721000280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1081721000280 is an abundant number, since it is smaller than the sum of its proper divisors (2163715142280).

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

1081721000280 is a wasteful number, since it uses less digits than its factorization.

1081721000280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 758740 (or 758736 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 30.

The spelling of 1081721000280 in words is "one trillion, eighty-one billion, seven hundred twenty-one million, two hundred eighty", and thus it is an aban number.