21213403601208 has 192 divisors, whose sum is σ = 66868967370240. Its totient is φ = 5489182213632.

The previous prime is 21213403601197. The next prime is 21213403601209. The reversal of 21213403601208 is 80210630431212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213403601209) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5543916 + ... + 8553467.

It is an arithmetic number, because the mean of its divisors is an integer number (348275871720).

Almost surely, 2^{21213403601208} is an apocalyptic number.

21213403601208 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21213403601208 is an abundant number, since it is smaller than the sum of its proper divisors (45655563769032).

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

21213403601208 is a wasteful number, since it uses less digits than its factorization.

21213403601208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14097478 (or 14097461 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 33.

The spelling of 21213403601208 in words is "twenty-one trillion, two hundred thirteen billion, four hundred three million, six hundred one thousand, two hundred eight".