21245413450 has 48 divisors (see below), whose sum is σ = 40267244160. Its totient is φ = 8338230720.

The previous prime is 21245413447. The next prime is 21245413459. The reversal of 21245413450 is 5431454212.

It is a super-2 number, since 2×21245413450² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21245413459) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 542427 + ... + 580273.

It is an arithmetic number, because the mean of its divisors is an integer number (838900920).

Almost surely, 2^21245413450 is an apocalyptic number.

21245413450 is a deficient number, since it is larger than the sum of its proper divisors (19021830710).

21245413450 is a wasteful number, since it uses less digits than its factorization.

21245413450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38071 (or 38066 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 31.

Adding to 21245413450 its reverse (5431454212), we get a palindrome (26676867662).

The spelling of 21245413450 in words is "twenty-one billion, two hundred forty-five million, four hundred thirteen thousand, four hundred fifty".