21149000 has 32 divisors (see below), whose sum is σ = 49491000. Its totient is φ = 8459200.

The previous prime is 21148979. The next prime is 21149021. The reversal of 21149000 is 94112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21148979) and next prime (21149021).

It can be written as a sum of positive squares in 4 ways, for example, as 2365444 + 18783556 = 1538^2 + 4334^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21149000.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9575 + ... + 11574.

Almost surely, 2^21149000 is an apocalyptic number.

21149000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21149000 is an abundant number, since it is smaller than the sum of its proper divisors (28342000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21149000 is a wasteful number, since it uses less digits than its factorization.

21149000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21170 (or 21156 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 21149000 is about 4598.8041923961. The cubic root of 21149000 is about 276.5433879246.

The spelling of 21149000 in words is "twenty-one million, one hundred forty-nine thousand".