10999421 has 8 divisors (see below), whose sum is σ = 11282040. Its totient is φ = 10720512.

The previous prime is 10999399. The next prime is 10999427. The reversal of 10999421 is 12499901.

10999421 = T₁₄₃ + T₁₄₄ + ... + T₄₀₉.

It can be written as a sum of positive squares in 4 ways, for example, as 436921 + 10562500 = 661^2 + 3250^2 .

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 10999421 - 2¹⁸ = 10737277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10999427) 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, 5651 + ... + 7343.

It is an arithmetic number, because the mean of its divisors is an integer number (1410255).

Almost surely, 2^10999421 is an apocalyptic number.

It is an amenable number.

10999421 is a deficient number, since it is larger than the sum of its proper divisors (282619).

10999421 is an equidigital number, since it uses as much as digits as its factorization.

10999421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1855.

The product of its (nonzero) digits is 5832, while the sum is 35.

The square root of 10999421 is about 3316.5375016725. The cubic root of 10999421 is about 222.3941069143.

The spelling of 10999421 in words is "ten million, nine hundred ninety-nine thousand, four hundred twenty-one".