21220212001001 has 32 divisors (see below), whose sum is σ = 23918454669312. Its totient is φ = 18679431260160.

The previous prime is 21220212000979. The next prime is 21220212001013. The reversal of 21220212001001 is 10010021202212.

It is a cyclic number.

It is not a de Polignac number, because 21220212001001 - 2⁴² = 16822165489897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21220212001031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 618593816 + ... + 618628118.

It is an arithmetic number, because the mean of its divisors is an integer number (747451708416).

Almost surely, 2^{21220212001001} is an apocalyptic number.

It is an amenable number.

21220212001001 is a deficient number, since it is larger than the sum of its proper divisors (2698242668311).

21220212001001 is a wasteful number, since it uses less digits than its factorization.

21220212001001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40553.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21220212001001 its reverse (10010021202212), we get a palindrome (31230233203213).

The spelling of 21220212001001 in words is "twenty-one trillion, two hundred twenty billion, two hundred twelve million, one thousand, one".