121121101122021 has 128 divisors (see below), whose sum is σ = 240970108538880. Its totient is φ = 58069088697600.

The previous prime is 121121101122017. The next prime is 121121101122023. The reversal of 121121101122021 is 120221101121121.

It is a happy number.

121121101122021 is a `hidden beast` number, since 1 + 211 + 211 + 0 + 1 + 1 + 220 + 21 = 666.

It is not a de Polignac number, because 121121101122021 - 2² = 121121101122017 is a prime.

It is a super-2 number, since 2×121121101122021² (a number of 29 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 121121101121985 and 121121101122003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121121101122023) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 143714826 + ... + 144555156.

It is an arithmetic number, because the mean of its divisors is an integer number (1882578972960).

Almost surely, 2^{121121101122021} is an apocalyptic number.

121121101122021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121121101122021 is a deficient number, since it is larger than the sum of its proper divisors (119849007416859).

121121101122021 is a wasteful number, since it uses less digits than its factorization.

121121101122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 845704 (or 845698 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 121121101122021 its reverse (120221101121121), we get a palindrome (241342202243142).

The spelling of 121121101122021 in words is "one hundred twenty-one trillion, one hundred twenty-one billion, one hundred one million, one hundred twenty-two thousand, twenty-one".