1061721100 has 36 divisors (see below), whose sum is σ = 2513386008. Its totient is φ = 386080000.

The previous prime is 1061721097. The next prime is 1061721113. The reversal of 1061721100 is 11271601.

It is a super-2 number, since 2×1061721100² = 2254503388370420000, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 481501 + ... + 483700.

It is an arithmetic number, because the mean of its divisors is an integer number (69816278).

Almost surely, 2^1061721100 is an apocalyptic number.

1061721100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1061721100 is an abundant number, since it is smaller than the sum of its proper divisors (1451664908).

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

1061721100 is a wasteful number, since it uses less digits than its factorization.

1061721100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 965226 (or 965219 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 19.

The square root of 1061721100 is about 32584.0620549372. The cubic root of 1061721100 is about 1020.1643654129.

Adding to 1061721100 its reverse (11271601), we get a palindrome (1072992701).

The spelling of 1061721100 in words is "one billion, sixty-one million, seven hundred twenty-one thousand, one hundred".