121001121021 has 32 divisors (see below), whose sum is σ = 182131689600. Its totient is φ = 70781518080.

The previous prime is 121001120971. The next prime is 121001121049. The reversal of 121001121021 is 120121100121.

It is not a de Polignac number, because 121001121021 - 2²¹ = 120999023869 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 121001120988 and 121001121006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121001121071) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3070575 + ... + 3109731.

It is an arithmetic number, because the mean of its divisors is an integer number (5691615300).

Almost surely, 2^121001121021 is an apocalyptic number.

121001121021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121001121021 is a deficient number, since it is larger than the sum of its proper divisors (61130568579).

121001121021 is a wasteful number, since it uses less digits than its factorization.

121001121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42429.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 121001121021 its reverse (120121100121), we get a palindrome (241122221142).

The spelling of 121001121021 in words is "one hundred twenty-one billion, one million, one hundred twenty-one thousand, twenty-one".