21011121020101 has 8 divisors (see below), whose sum is σ = 21014128235520. Its totient is φ = 21008114007888.

The previous prime is 21011121020081. The next prime is 21011121020111. The reversal of 21011121020101 is 10102012111012.

It is a happy number.

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 21011121020101 - 2⁹ = 21011121019589 is a prime.

It is a super-3 number, since 3×21011121020101³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011121020111) 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, 430117060 + ... + 430165906.

It is an arithmetic number, because the mean of its divisors is an integer number (2626766029440).

Almost surely, 2^{21011121020101} is an apocalyptic number.

It is an amenable number.

21011121020101 is a deficient number, since it is larger than the sum of its proper divisors (3007215419).

21011121020101 is a wasteful number, since it uses less digits than its factorization.

21011121020101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101603.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21011121020101 its reverse (10102012111012), we get a palindrome (31113133131113).

It can be divided in two parts, 2101112 and 1020101, that added together give a palindrome (3121213).

The spelling of 21011121020101 in words is "twenty-one trillion, eleven billion, one hundred twenty-one million, twenty thousand, one hundred one".