21313121214 has 64 divisors (see below), whose sum is σ = 53178757632. Its totient is φ = 5532297600.

The previous prime is 21313121197. The next prime is 21313121227. The reversal of 21313121214 is 41212131312.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

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, 742204 + ... + 770384.

It is an arithmetic number, because the mean of its divisors is an integer number (830918088).

Almost surely, 2^21313121214 is an apocalyptic number.

21313121214 is an abundant number, since it is smaller than the sum of its proper divisors (31865636418).

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

21313121214 is a wasteful number, since it uses less digits than its factorization.

21313121214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29841.

The product of its digits is 288, while the sum is 21.

Adding to 21313121214 its reverse (41212131312), we get a palindrome (62525252526).

The spelling of 21313121214 in words is "twenty-one billion, three hundred thirteen million, one hundred twenty-one thousand, two hundred fourteen".