121202021 has 4 divisors (see below), whose sum is σ = 121311072. Its totient is φ = 121092972.

The previous prime is 121202017. The next prime is 121202063. The reversal of 121202021 is 120202121.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 121202021 - 2² = 121202017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121201993 and 121202011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121202821) 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, 52841 + ... + 55086.

It is an arithmetic number, because the mean of its divisors is an integer number (30327768).

Almost surely, 2^121202021 is an apocalyptic number.

It is an amenable number.

121202021 is a deficient number, since it is larger than the sum of its proper divisors (109051).

121202021 is a wasteful number, since it uses less digits than its factorization.

121202021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109050.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 121202021 is about 11009.1789430457. The cubic root of 121202021 is about 494.8838567085.

Adding to 121202021 its reverse (120202121), we get a palindrome (241404142).

It can be divided in two parts, 12120 and 2021, that added together give a palindrome (14141).

The spelling of 121202021 in words is "one hundred twenty-one million, two hundred two thousand, twenty-one".