21029190 has 64 divisors (see below), whose sum is σ = 62125056. Its totient is φ = 4436352.

The previous prime is 21029189. The next prime is 21029207. The reversal of 21029190 is 9192012.

21029190 = 435² + 436² + ... + 525².

It is a super-2 number, since 2×21029190² = 884453664112200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21029190.

It is a congruent 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, 1122 + ... + 6581.

It is an arithmetic number, because the mean of its divisors is an integer number (970704).

Almost surely, 2^21029190 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21029190, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31062528).

21029190 is an abundant number, since it is smaller than the sum of its proper divisors (41095866).

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

21029190 is a wasteful number, since it uses less digits than its factorization.

21029190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7733.

The product of its (nonzero) digits is 324, while the sum is 24.

The square root of 21029190 is about 4585.7594790830. The cubic root of 21029190 is about 276.0201886093.

The spelling of 21029190 in words is "twenty-one million, twenty-nine thousand, one hundred ninety".