21003836292 has 108 divisors (see below), whose sum is σ = 56151626076. Its totient is φ = 6618931200.

The previous prime is 21003836263. The next prime is 21003836297. The reversal of 21003836292 is 29263830012.

21003836292 is a `hidden beast` number, since 21 + 0 + 0 + 3 + 8 + 3 + 629 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 17367022656 + 3636813636 = 131784^2 + 60306^2 .

It is a super-2 number, since 2×21003836292² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (21003836297) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 7497292 + ... + 7500092.

Almost surely, 2^21003836292 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21003836292, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28075813038).

21003836292 is an abundant number, since it is smaller than the sum of its proper divisors (35147789784).

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

21003836292 is a wasteful number, since it uses less digits than its factorization.

21003836292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3426 (or 3402 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The spelling of 21003836292 in words is "twenty-one billion, three million, eight hundred thirty-six thousand, two hundred ninety-two".