21029010 has 64 divisors (see below), whose sum is σ = 53913600. Its totient is φ = 5234112.

The previous prime is 21029003. The next prime is 21029033. The reversal of 21029010 is 1092012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44797 + ... + 45263.

It is an arithmetic number, because the mean of its divisors is an integer number (842400).

Almost surely, 2^21029010 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21029010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26956800).

21029010 is an abundant number, since it is smaller than the sum of its proper divisors (32884590).

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

21029010 is a wasteful number, since it uses less digits than its factorization.

21029010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 21029010 is about 4585.7398530662. The cubic root of 21029010 is about 276.0194010727.

The spelling of 21029010 in words is "twenty-one million, twenty-nine thousand, ten".