21240947310 has 64 divisors (see below), whose sum is σ = 55697621760. Its totient is φ = 5141454080.

The previous prime is 21240947297. The next prime is 21240947341. The reversal of 21240947310 is 1374904212.

It is a super-2 number, since 2×21240947310² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 168634 + ... + 266306.

It is an arithmetic number, because the mean of its divisors is an integer number (870275340).

Almost surely, 2^21240947310 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21240947310, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27848810880).

21240947310 is an abundant number, since it is smaller than the sum of its proper divisors (34456674450).

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

21240947310 is a wasteful number, since it uses less digits than its factorization.

21240947310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98353.

The product of its (nonzero) digits is 12096, while the sum is 33.

The spelling of 21240947310 in words is "twenty-one billion, two hundred forty million, nine hundred forty-seven thousand, three hundred ten".