21212222300031 has 12 divisors (see below), whose sum is σ = 32900589690072. Its totient is φ = 12121269885648.

The previous prime is 21212222300021. The next prime is 21212222300089. The reversal of 21212222300031 is 13000322221212.

It is not a de Polignac number, because 21212222300031 - 2¹¹ = 21212222297983 is a prime.

It is a super-2 number, since 2×21212222300031² (a number of 27 digits) contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 21212222299980 and 21212222300007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212222300021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 72150415840 + ... + 72150416133.

It is an arithmetic number, because the mean of its divisors is an integer number (2741715807506).

Almost surely, 2^{21212222300031} is an apocalyptic number.

21212222300031 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21212222300031 is a deficient number, since it is larger than the sum of its proper divisors (11688367390041).

21212222300031 is a wasteful number, since it uses less digits than its factorization.

21212222300031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144300831990 (or 144300831983 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21212222300031 its reverse (13000322221212), we get a palindrome (34212544521243).

The spelling of 21212222300031 in words is "twenty-one trillion, two hundred twelve billion, two hundred twenty-two million, three hundred thousand, thirty-one".