21010488 has 32 divisors (see below), whose sum is σ = 53750400. Its totient is φ = 6840288.

The previous prime is 21010469. The next prime is 21010489. The reversal of 21010488 is 88401012.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010489) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9148 + ... + 11211.

It is an arithmetic number, because the mean of its divisors is an integer number (1679700).

Almost surely, 2^21010488 is an apocalyptic number.

It is an amenable number.

21010488 is an abundant number, since it is smaller than the sum of its proper divisors (32739912).

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

21010488 is a wasteful number, since it uses less digits than its factorization.

21010488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20411 (or 20407 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 24.

The square root of 21010488 is about 4583.7198867296. The cubic root of 21010488 is about 275.9383395127.

The spelling of 21010488 in words is "twenty-one million, ten thousand, four hundred eighty-eight".