21213613220052 has 48 divisors (see below), whose sum is σ = 54021005986752. Its totient is φ = 6425663143680.

The previous prime is 21213613220021. The next prime is 21213613220071. The reversal of 21213613220052 is 25002231631212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33491283 + ... + 34118810.

It is an arithmetic number, because the mean of its divisors is an integer number (1125437624724).

Almost surely, 2^{21213613220052} is an apocalyptic number.

21213613220052 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21213613220052 is an abundant number, since it is smaller than the sum of its proper divisors (32807392766700).

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

21213613220052 is a wasteful number, since it uses less digits than its factorization.

21213613220052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67612488 (or 67612486 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

Adding to 21213613220052 its reverse (25002231631212), we get a palindrome (46215844851264).

The spelling of 21213613220052 in words is "twenty-one trillion, two hundred thirteen billion, six hundred thirteen million, two hundred twenty thousand, fifty-two".