21212212001001 has 16 divisors (see below), whose sum is σ = 34024600704000. Its totient is φ = 11483302737168.

The previous prime is 21212212000981. The next prime is 21212212001033. The reversal of 21212212001001 is 10010021221212.

It is not a de Polignac number, because 21212212001001 - 2⁶ = 21212212000937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21212212002001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26581718901 + ... + 26581719698.

It is an arithmetic number, because the mean of its divisors is an integer number (2126537544000).

Almost surely, 2^{21212212001001} is an apocalyptic number.

21212212001001 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21212212001001 is a deficient number, since it is larger than the sum of its proper divisors (12812388702999).

21212212001001 is a wasteful number, since it uses less digits than its factorization.

21212212001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53163438628.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21212212001001 its reverse (10010021221212), we get a palindrome (31222233222213).

The spelling of 21212212001001 in words is "twenty-one trillion, two hundred twelve billion, two hundred twelve million, one thousand, one".