121001012021 has 16 divisors (see below), whose sum is σ = 123119068800. Its totient is φ = 118902738240.

The previous prime is 121001012009. The next prime is 121001012029. The reversal of 121001012021 is 120210100121.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121001012021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121001011993 and 121001012011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121001012029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17967971 + ... + 17974703.

It is an arithmetic number, because the mean of its divisors is an integer number (7694941800).

Almost surely, 2^121001012021 is an apocalyptic number.

It is an amenable number.

121001012021 is a deficient number, since it is larger than the sum of its proper divisors (2118056779).

121001012021 is a wasteful number, since it uses less digits than its factorization.

121001012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8156.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 121001012021 its reverse (120210100121), we get a palindrome (241211112142).

The spelling of 121001012021 in words is "one hundred twenty-one billion, one million, twelve thousand, twenty-one".