21011002211201 has 4 divisors (see below), whose sum is σ = 21011011495872. Its totient is φ = 21010992926532.

The previous prime is 21011002211167. The next prime is 21011002211209. The reversal of 21011002211201 is 10211220011012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21011002211201 - 2⁶ = 21011002211137 is a prime.

It is a super-2 number, since 2×21011002211201² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21011002211209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1218620 + ... + 6595986.

It is an arithmetic number, because the mean of its divisors is an integer number (5252752873968).

Almost surely, 2^{21011002211201} is an apocalyptic number.

It is an amenable number.

21011002211201 is a deficient number, since it is larger than the sum of its proper divisors (9284671).

21011002211201 is an equidigital number, since it uses as much as digits as its factorization.

21011002211201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9284670.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21011002211201 its reverse (10211220011012), we get a palindrome (31222222222213).

The spelling of 21011002211201 in words is "twenty-one trillion, eleven billion, two million, two hundred eleven thousand, two hundred one".