10999621 has 2 divisors, whose sum is σ = 10999622. Its totient is φ = 10999620.

The previous prime is 10999601. The next prime is 10999631. The reversal of 10999621 is 12699901.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9523396 + 1476225 = 3086^2 + 1215^2 .

It is a cyclic number.

It is not a de Polignac number, because 10999621 - 2¹¹ = 10997573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10999601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5499810 + 5499811.

It is an arithmetic number, because the mean of its divisors is an integer number (5499811).

Almost surely, 2^10999621 is an apocalyptic number.

It is an amenable number.

10999621 is a deficient number, since it is larger than the sum of its proper divisors (1).

10999621 is an equidigital number, since it uses as much as digits as its factorization.

10999621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8748, while the sum is 37.

The square root of 10999621 is about 3316.5676534634. The cubic root of 10999621 is about 222.3954548202.

The spelling of 10999621 in words is "ten million, nine hundred ninety-nine thousand, six hundred twenty-one".