10721655 has 48 divisors (see below), whose sum is σ = 21513024. Its totient is φ = 4838400.

The previous prime is 10721653. The next prime is 10721723. The reversal of 10721655 is 55612701.

10721655 is a `hidden beast` number, since 1 + 0 + 7 + 2 + 1 + 655 = 666.

It is not a de Polignac number, because 10721655 - 2¹ = 10721653 is a prime.

It is a super-2 number, since 2×10721655² = 229907771878050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10721653) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 31647 + ... + 31983.

It is an arithmetic number, because the mean of its divisors is an integer number (448188).

Almost surely, 2^10721655 is an apocalyptic number.

10721655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

10721655 is an abundant number, since it is smaller than the sum of its proper divisors (10791369).

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

10721655 is a wasteful number, since it uses less digits than its factorization.

10721655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456 (or 453 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 27.

The square root of 10721655 is about 3274.3938370330. The cubic root of 10721655 is about 220.5061006842.

The spelling of 10721655 in words is "ten million, seven hundred twenty-one thousand, six hundred fifty-five".