21034729240 has 64 divisors (see below), whose sum is σ = 54109488960. Its totient is φ = 7209216000.

The previous prime is 21034729237. The next prime is 21034729253. The reversal of 21034729240 is 4292743012.

It is a super-2 number, since 2×21034729240² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21034729196 and 21034729205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 827764 + ... + 852796.

It is an arithmetic number, because the mean of its divisors is an integer number (845460765).

Almost surely, 2^21034729240 is an apocalyptic number.

21034729240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21034729240 is an abundant number, since it is smaller than the sum of its proper divisors (33074759720).

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

21034729240 is a wasteful number, since it uses less digits than its factorization.

21034729240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28052 (or 28048 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 34.

The spelling of 21034729240 in words is "twenty-one billion, thirty-four million, seven hundred twenty-nine thousand, two hundred forty".