21213245055 has 8 divisors (see below), whose sum is σ = 33941192112. Its totient is φ = 11313730688.

The previous prime is 21213245051. The next prime is 21213245057. The reversal of 21213245055 is 55054231212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21213245055 - 2² = 21213245051 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213245051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 707108154 + ... + 707108183.

It is an arithmetic number, because the mean of its divisors is an integer number (4242649014).

Almost surely, 2^21213245055 is an apocalyptic number.

21213245055 is a deficient number, since it is larger than the sum of its proper divisors (12727947057).

21213245055 is a wasteful number, since it uses less digits than its factorization.

21213245055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1414216345.

The product of its (nonzero) digits is 12000, while the sum is 30.

Adding to 21213245055 its reverse (55054231212), we get a palindrome (76267476267).

The spelling of 21213245055 in words is "twenty-one billion, two hundred thirteen million, two hundred forty-five thousand, fifty-five".