21405645300310 has 32 divisors (see below), whose sum is σ = 38662828841952. Its totient is φ = 8532827116800.

The previous prime is 21405645300293. The next prime is 21405645300311. The reversal of 21405645300310 is 1300354650412.

It is a super-2 number, since 2×21405645300310² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21405645300311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 220512 + ... + 6546748.

It is an arithmetic number, because the mean of its divisors is an integer number (1208213401311).

Almost surely, 2^{21405645300310} is an apocalyptic number.

21405645300310 is a deficient number, since it is larger than the sum of its proper divisors (17257183541642).

21405645300310 is a wasteful number, since it uses less digits than its factorization.

21405645300310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6327408.

The product of its (nonzero) digits is 43200, while the sum is 34.

Adding to 21405645300310 its reverse (1300354650412), we get a palindrome (22705999950722).

The spelling of 21405645300310 in words is "twenty-one trillion, four hundred five billion, six hundred forty-five million, three hundred thousand, three hundred ten".