21121102101201 has 4 divisors (see below), whose sum is σ = 28161469468272. Its totient is φ = 14080734734132.

The previous prime is 21121102101193. The next prime is 21121102101233. The reversal of 21121102101201 is 10210120112112.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 21121102101201 - 2³ = 21121102101193 is a prime.

It is a super-2 number, since 2×21121102101201² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21121102111201) 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, 3520183683531 + ... + 3520183683536.

It is an arithmetic number, because the mean of its divisors is an integer number (7040367367068).

Almost surely, 2^{21121102101201} is an apocalyptic number.

It is an amenable number.

21121102101201 is a deficient number, since it is larger than the sum of its proper divisors (7040367367071).

21121102101201 is an equidigital number, since it uses as much as digits as its factorization.

21121102101201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7040367367070.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21121102101201 its reverse (10210120112112), we get a palindrome (31331222213313).

The spelling of 21121102101201 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred two million, one hundred one thousand, two hundred one".