21315233233420 has 96 divisors (see below), whose sum is σ = 52892364349440. Its totient is φ = 7060872107520.

The previous prime is 21315233233397. The next prime is 21315233233421. The reversal of 21315233233420 is 2433233251312.

It is not an unprimeable number, because it can be changed into a prime (21315233233421) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1302240 + ... + 6657799.

It is an arithmetic number, because the mean of its divisors is an integer number (550962128640).

Almost surely, 2^{21315233233420} is an apocalyptic number.

21315233233420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21315233233420 is an abundant number, since it is smaller than the sum of its proper divisors (31577131116020).

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

21315233233420 is a wasteful number, since it uses less digits than its factorization.

21315233233420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7960703 (or 7960701 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 34.

Adding to 21315233233420 its reverse (2433233251312), we get a palindrome (23748466484732).

The spelling of 21315233233420 in words is "twenty-one trillion, three hundred fifteen billion, two hundred thirty-three million, two hundred thirty-three thousand, four hundred twenty".