21129348 has 12 divisors (see below), whose sum is σ = 49301840. Its totient is φ = 7043112.

The previous prime is 21129343. The next prime is 21129359. The reversal of 21129348 is 84392112.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (21129343) 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, 880378 + ... + 880401.

Almost surely, 2^21129348 is an apocalyptic number.

It is an amenable number.

21129348 is an abundant number, since it is smaller than the sum of its proper divisors (28172492).

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

21129348 is a wasteful number, since it uses less digits than its factorization.

21129348 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1760786 (or 1760784 counting only the distinct ones).

The product of its digits is 3456, while the sum is 30.

The square root of 21129348 is about 4596.6670534203. The cubic root of 21129348 is about 276.4577051524.

The spelling of 21129348 in words is "twenty-one million, one hundred twenty-nine thousand, three hundred forty-eight".