101055721 has 16 divisors (see below), whose sum is σ = 114436224. Its totient is φ = 88539264.

The previous prime is 101055697. The next prime is 101055727. The reversal of 101055721 is 127550101.

It is not a de Polignac number, because 101055721 - 2¹⁹ = 100531433 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 101055692 and 101055701.

It is not an unprimeable number, because it can be changed into a prime (101055727) 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, 39730 + ... + 42196.

It is an arithmetic number, because the mean of its divisors is an integer number (7152264).

Almost surely, 2^101055721 is an apocalyptic number.

It is an amenable number.

101055721 is a deficient number, since it is larger than the sum of its proper divisors (13380503).

101055721 is a wasteful number, since it uses less digits than its factorization.

101055721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2640.

The product of its (nonzero) digits is 350, while the sum is 22.

The square root of 101055721 is about 10052.6474622360. The cubic root of 101055721 is about 465.7865763649.

The spelling of 101055721 in words is "one hundred one million, fifty-five thousand, seven hundred twenty-one".