21201011220001 has 8 divisors (see below), whose sum is σ = 21510350864064. Its totient is φ = 20891969738640.

The previous prime is 21201011219989. The next prime is 21201011220083. The reversal of 21201011220001 is 10002211010212.

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 21201011220001 - 2⁷ = 21201011219873 is a prime.

It is a super-7 number, since 7×21201011220001⁷ (a number of 95 digits) contains 7777777 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21201011229001) 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, 74397426 + ... + 74681851.

It is an arithmetic number, because the mean of its divisors is an integer number (2688793858008).

Almost surely, 2^{21201011220001} is an apocalyptic number.

It is an amenable number.

21201011220001 is a deficient number, since it is larger than the sum of its proper divisors (309339644063).

21201011220001 is a wasteful number, since it uses less digits than its factorization.

21201011220001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149081351.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21201011220001 its reverse (10002211010212), we get a palindrome (31203222230213).

The spelling of 21201011220001 in words is "twenty-one trillion, two hundred one billion, eleven million, two hundred twenty thousand, one".