21001048 has 16 divisors (see below), whose sum is σ = 39507480. Its totient is φ = 10465728.

The previous prime is 21001037. The next prime is 21001049. The reversal of 21001048 is 84010012.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001049) 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, 1690 + ... + 6697.

Almost surely, 2^21001048 is an apocalyptic number.

It is an amenable number.

21001048 is a deficient number, since it is larger than the sum of its proper divisors (18506432).

21001048 is a wasteful number, since it uses less digits than its factorization.

21001048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8706 (or 8702 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 21001048 is about 4582.6900397038. The cubic root of 21001048 is about 275.8970070102.

The spelling of 21001048 in words is "twenty-one million, one thousand, forty-eight".