21212213120031 has 8 divisors (see below), whose sum is σ = 28816591408560. Its totient is φ = 13874655122432.

The previous prime is 21212213120027. The next prime is 21212213120081. The reversal of 21212213120031 is 13002131221212.

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 21212213120031 - 2² = 21212213120027 is a prime.

It is a super-2 number, since 2×21212213120031² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212213120081) 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, 66705072546 + ... + 66705072863.

It is an arithmetic number, because the mean of its divisors is an integer number (3602073926070).

Almost surely, 2^{21212213120031} is an apocalyptic number.

21212213120031 is a deficient number, since it is larger than the sum of its proper divisors (7604378288529).

21212213120031 is a wasteful number, since it uses less digits than its factorization.

21212213120031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133410145465.

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

Adding to 21212213120031 its reverse (13002131221212), we get a palindrome (34214344341243).

The spelling of 21212213120031 in words is "twenty-one trillion, two hundred twelve billion, two hundred thirteen million, one hundred twenty thousand, thirty-one".