121036021 has 4 divisors (see below), whose sum is σ = 122211232. Its totient is φ = 119860812.

The previous prime is 121035983. The next prime is 121036031. The reversal of 121036021 is 120630121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 120630121 = 4789 ⋅25189.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121036021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121035986 and 121036004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121036031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 587451 + ... + 587656.

It is an arithmetic number, because the mean of its divisors is an integer number (30552808).

Almost surely, 2^121036021 is an apocalyptic number.

It is an amenable number.

121036021 is a deficient number, since it is larger than the sum of its proper divisors (1175211).

121036021 is a wasteful number, since it uses less digits than its factorization.

121036021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1175210.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 121036021 is about 11001.6371963449. The cubic root of 121036021 is about 494.6578201759.

Adding to 121036021 its reverse (120630121), we get a palindrome (241666142).

The spelling of 121036021 in words is "one hundred twenty-one million, thirty-six thousand, twenty-one".