121100210210021 has 16 divisors (see below), whose sum is σ = 141238486224000. Its totient is φ = 103790072985984.

The previous prime is 121100210209997. The next prime is 121100210210131. The reversal of 121100210210021 is 120012012001121.

It is a de Polignac number, because none of the positive numbers 2^k-121100210210021 is a prime.

It is a super-2 number, since 2×121100210210021² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121100210209978 and 121100210210005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121100210210521) 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, 13660331 + ... + 20707608.

It is an arithmetic number, because the mean of its divisors is an integer number (8827405389000).

Almost surely, 2^{121100210210021} is an apocalyptic number.

It is an amenable number.

121100210210021 is a deficient number, since it is larger than the sum of its proper divisors (20138276013979).

121100210210021 is an equidigital number, since it uses as much as digits as its factorization.

121100210210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34378233 (or 34378219 counting only the distinct ones).

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

Adding to 121100210210021 its reverse (120012012001121), we get a palindrome (241112222211142).

The spelling of 121100210210021 in words is "one hundred twenty-one trillion, one hundred billion, two hundred ten million, two hundred ten thousand, twenty-one".