21212010022021 has 64 divisors (see below), whose sum is σ = 28600227532800. Its totient is φ = 15248945811456.

The previous prime is 21212010021989. The next prime is 21212010022057. The reversal of 21212010022021 is 12022001021212.

It is a happy number.

It is not a de Polignac number, because 21212010022021 - 2⁵ = 21212010021989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21212010021986 and 21212010022004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212010022121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 340434156 + ... + 340496458.

It is an arithmetic number, because the mean of its divisors is an integer number (446878555200).

Almost surely, 2^{21212010022021} is an apocalyptic number.

It is an amenable number.

21212010022021 is a deficient number, since it is larger than the sum of its proper divisors (7388217510779).

21212010022021 is a wasteful number, since it uses less digits than its factorization.

21212010022021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69958.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21212010022021 its reverse (12022001021212), we get a palindrome (33234011043233).

The spelling of 21212010022021 in words is "twenty-one trillion, two hundred twelve billion, ten million, twenty-two thousand, twenty-one".