21312301513430 has 32 divisors (see below), whose sum is σ = 39477430080000. Its totient is φ = 8279848152160.

The previous prime is 21312301513421. The next prime is 21312301513471. The reversal of 21312301513430 is 3431510321312.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21312301513393 and 21312301513402.

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, 173012180 + ... + 173135319.

It is an arithmetic number, because the mean of its divisors is an integer number (1233669690000).

Almost surely, 2^{21312301513430} is an apocalyptic number.

21312301513430 is a deficient number, since it is larger than the sum of its proper divisors (18165128566570).

21312301513430 is a wasteful number, since it uses less digits than its factorization.

21312301513430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346147684.

The product of its (nonzero) digits is 6480, while the sum is 29.

Adding to 21312301513430 its reverse (3431510321312), we get a palindrome (24743811834742).

The spelling of 21312301513430 in words is "twenty-one trillion, three hundred twelve billion, three hundred one million, five hundred thirteen thousand, four hundred thirty".