21121120101201 has 16 divisors (see below), whose sum is σ = 28849277882880. Its totient is φ = 13736876401280.

The previous prime is 21121120101181. The next prime is 21121120101223. The reversal of 21121120101201 is 10210102112112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21121120101201 - 2¹⁴ = 21121120084817 is a prime.

It is a super-2 number, since 2×21121120101201² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21121120101241) 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, 1166215 + ... + 6603203.

It is an arithmetic number, because the mean of its divisors is an integer number (1803079867680).

Almost surely, 2^{21121120101201} is an apocalyptic number.

It is an amenable number.

21121120101201 is a deficient number, since it is larger than the sum of its proper divisors (7728157781679).

21121120101201 is a wasteful number, since it uses less digits than its factorization.

21121120101201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5468616.

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

Adding to 21121120101201 its reverse (10210102112112), we get a palindrome (31331222213313).

The spelling of 21121120101201 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred twenty million, one hundred one thousand, two hundred one".