10653721 has 8 divisors (see below), whose sum is σ = 11498760. Its totient is φ = 9812352.

The previous prime is 10653719. The next prime is 10653733. The reversal of 10653721 is 12735601.

It can be written as a sum of positive squares in 4 ways, for example, as 19600 + 10634121 = 140^2 + 3261^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 10653721 - 2¹ = 10653719 is a prime.

It is a super-2 number, since 2×10653721² = 227003542291682, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (10653751) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10011 + ... + 11023.

It is an arithmetic number, because the mean of its divisors is an integer number (1437345).

Almost surely, 2^10653721 is an apocalyptic number.

It is an amenable number.

10653721 is a deficient number, since it is larger than the sum of its proper divisors (845039).

10653721 is a wasteful number, since it uses less digits than its factorization.

10653721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1835.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 10653721 is about 3264.0038296546. The cubic root of 10653721 is about 220.0393937721.

Subtracting from 10653721 its sum of digits (25), we obtain a square (10653696 = 3264²).

The spelling of 10653721 in words is "ten million, six hundred fifty-three thousand, seven hundred twenty-one".