21312120212300 has 36 divisors (see below), whose sum is σ = 46264973305320. Its totient is φ = 8521590491520.

The previous prime is 21312120212269. The next prime is 21312120212321. The reversal of 21312120212300 is 321202121312.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40456910 + ... + 40980309.

It is an arithmetic number, because the mean of its divisors is an integer number (1285138147370).

Almost surely, 2^{21312120212300} is an apocalyptic number.

21312120212300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21312120212300 is an abundant number, since it is smaller than the sum of its proper divisors (24952853093020).

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

21312120212300 is a wasteful number, since it uses less digits than its factorization.

21312120212300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81439850 (or 81439843 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21312120212300 its reverse (321202121312), we get a palindrome (21633322333612).

The spelling of 21312120212300 in words is "twenty-one trillion, three hundred twelve billion, one hundred twenty million, two hundred twelve thousand, three hundred".