21016148 has 24 divisors (see below), whose sum is σ = 39998952. Its totient is φ = 9621504.

The previous prime is 21016139. The next prime is 21016153. The reversal of 21016148 is 84161012.

It can be written as a sum of positive squares in 4 ways, for example, as 11847364 + 9168784 = 3442^2 + 3028^2 .

It is a congruent number.

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, 1661 + ... + 6692.

It is an arithmetic number, because the mean of its divisors is an integer number (1666623).

Almost surely, 2^21016148 is an apocalyptic number.

It is an amenable number.

21016148 is a deficient number, since it is larger than the sum of its proper divisors (18982804).

21016148 is a wasteful number, since it uses less digits than its factorization.

21016148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8411 (or 8409 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 23.

The square root of 21016148 is about 4584.3372476291. The cubic root of 21016148 is about 275.9631155639.

The spelling of 21016148 in words is "twenty-one million, sixteen thousand, one hundred forty-eight".