100051721 has 16 divisors (see below), whose sum is σ = 125411328. Its totient is φ = 77542800.

The previous prime is 100051687. The next prime is 100051723. The reversal of 100051721 is 127150001.

It is a cyclic number.

It is not a de Polignac number, because 100051721 - 2⁶ = 100051657 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 100051721.

It is not an unprimeable number, because it can be changed into a prime (100051723) 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, 11306 + ... + 18108.

It is an arithmetic number, because the mean of its divisors is an integer number (7838208).

Almost surely, 2^100051721 is an apocalyptic number.

100051721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

100051721 is a deficient number, since it is larger than the sum of its proper divisors (25359607).

100051721 is a wasteful number, since it uses less digits than its factorization.

100051721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7012.

The product of its (nonzero) digits is 70, while the sum is 17.

The square root of 100051721 is about 10002.5857157037. The cubic root of 100051721 is about 464.2388921078.

The spelling of 100051721 in words is "one hundred million, fifty-one thousand, seven hundred twenty-one".