10721539 has 4 divisors (see below), whose sum is σ = 10903320. Its totient is φ = 10539760.

The previous prime is 10721489. The next prime is 10721549. The reversal of 10721539 is 93512701.

10721539 = 241² + 242² + ... + 358².

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93512701 = 367 ⋅254803.

It is not a de Polignac number, because 10721539 - 2¹³ = 10713347 is a prime.

It is a super-2 number, since 2×10721539² = 229902797057042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10721549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90802 + ... + 90919.

It is an arithmetic number, because the mean of its divisors is an integer number (2725830).

Almost surely, 2^10721539 is an apocalyptic number.

10721539 is a deficient number, since it is larger than the sum of its proper divisors (181781).

10721539 is an equidigital number, since it uses as much as digits as its factorization.

10721539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181780.

The product of its (nonzero) digits is 1890, while the sum is 28.

The square root of 10721539 is about 3274.3761237830. The cubic root of 10721539 is about 220.5053054463.

The spelling of 10721539 in words is "ten million, seven hundred twenty-one thousand, five hundred thirty-nine".