21029301000 has 160 divisors (see below), whose sum is σ = 73509373080. Its totient is φ = 5607792000.

The previous prime is 21029300989. The next prime is 21029301043. The reversal of 21029301000 is 10392012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4433162724 + 16596138276 = 66582^2 + 128826^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 48811 + ... + 210810.

Almost surely, 2^21029301000 is an apocalyptic number.

21029301000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21029301000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36754686540).

21029301000 is an abundant number, since it is smaller than the sum of its proper divisors (52480072080).

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

21029301000 is a wasteful number, since it uses less digits than its factorization.

21029301000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259654 (or 259631 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 21029301000 its reverse (10392012), we get a palindrome (21039693012).

The spelling of 21029301000 in words is "twenty-one billion, twenty-nine million, three hundred one thousand".