10721651 has 4 divisors (see below), whose sum is σ = 10787592. Its totient is φ = 10655712.

The previous prime is 10721621. The next prime is 10721653. The reversal of 10721651 is 15612701.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 10721651 - 2⁶ = 10721587 is a prime.

It is a super-2 number, since 2×10721651² = 229907600331602, which contains 22 as substring.

It is a Duffinian number.

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

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 3 ways as a sum of consecutive naturals, for example, 32726 + ... + 33051.

It is an arithmetic number, because the mean of its divisors is an integer number (2696898).

Almost surely, 2^10721651 is an apocalyptic number.

10721651 is a deficient number, since it is larger than the sum of its proper divisors (65941).

10721651 is an equidigital number, since it uses as much as digits as its factorization.

10721651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65940.

The product of its (nonzero) digits is 420, while the sum is 23.

The square root of 10721651 is about 3274.3932262329. The cubic root of 10721651 is about 220.5060732623.

The spelling of 10721651 in words is "ten million, seven hundred twenty-one thousand, six hundred fifty-one".