10997621 has 4 divisors (see below), whose sum is σ = 11294892. Its totient is φ = 10700352.

The previous prime is 10997603. The next prime is 10997633. The reversal of 10997621 is 12679901.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3783025 + 7214596 = 1945^2 + 2686^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10997621 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10997221) 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, 148580 + ... + 148653.

It is an arithmetic number, because the mean of its divisors is an integer number (2823723).

Almost surely, 2^10997621 is an apocalyptic number.

It is an amenable number.

10997621 is a deficient number, since it is larger than the sum of its proper divisors (297271).

10997621 is an equidigital number, since it uses as much as digits as its factorization.

10997621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297270.

The product of its (nonzero) digits is 6804, while the sum is 35.

The square root of 10997621 is about 3316.2661232175. The cubic root of 10997621 is about 222.3819750263.

The spelling of 10997621 in words is "ten million, nine hundred ninety-seven thousand, six hundred twenty-one".