21420321320310 has 64 divisors (see below), whose sum is σ = 56637566164224. Its totient is φ = 5141391248000.

The previous prime is 21420321320231. The next prime is 21420321320339. The reversal of 21420321320310 is 1302312302412.

It is a super-2 number, since 2×21420321320310² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 321303624 + ... + 321370283.

It is an arithmetic number, because the mean of its divisors is an integer number (884961971316).

Almost surely, 2^{21420321320310} is an apocalyptic number.

21420321320310 is an abundant number, since it is smaller than the sum of its proper divisors (35217244843914).

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

21420321320310 is a wasteful number, since it uses less digits than its factorization.

21420321320310 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642674029.

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21420321320310 its reverse (1302312302412), we get a palindrome (22722633622722).

The spelling of 21420321320310 in words is "twenty-one trillion, four hundred twenty billion, three hundred twenty-one million, three hundred twenty thousand, three hundred ten".