21148803 has 32 divisors (see below), whose sum is σ = 34171200. Its totient is φ = 12849408.

The previous prime is 21148783. The next prime is 21148807. The reversal of 21148803 is 30884112.

It is not a de Polignac number, because 21148803 - 2¹² = 21144707 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21148807) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30901 + ... + 31577.

It is an arithmetic number, because the mean of its divisors is an integer number (1067850).

Almost surely, 2^21148803 is an apocalyptic number.

21148803 is a deficient number, since it is larger than the sum of its proper divisors (13022397).

21148803 is a wasteful number, since it uses less digits than its factorization.

21148803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 788 (or 782 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 21148803 is about 4598.7827737348. The cubic root of 21148803 is about 276.5425292675.

The spelling of 21148803 in words is "twenty-one million, one hundred forty-eight thousand, eight hundred three".