21213442201244 has 6 divisors (see below), whose sum is σ = 37123523852184. Its totient is φ = 10606721100620.

The previous prime is 21213442201223. The next prime is 21213442201249. The reversal of 21213442201244 is 44210224431212.

It is a self number, because there is not a number n which added to its sum of digits gives 21213442201244.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213442201249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2651680275152 + ... + 2651680275159.

It is an arithmetic number, because the mean of its divisors is an integer number (6187253975364).

Almost surely, 2^{21213442201244} is an apocalyptic number.

It is an amenable number.

21213442201244 is a deficient number, since it is larger than the sum of its proper divisors (15910081650940).

21213442201244 is a wasteful number, since it uses less digits than its factorization.

21213442201244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5303360550315 (or 5303360550313 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 32.

Adding to 21213442201244 its reverse (44210224431212), we get a palindrome (65423666632456).

The spelling of 21213442201244 in words is "twenty-one trillion, two hundred thirteen billion, four hundred forty-two million, two hundred one thousand, two hundred forty-four".