121022002021 has 4 divisors (see below), whose sum is σ = 121381118092. Its totient is φ = 120662885952.

The previous prime is 121022001973. The next prime is 121022002039. The reversal of 121022002021 is 120200220121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120200220121 = 23 ⋅5226096527.

It can be written as a sum of positive squares in 2 ways, for example, as 58993608996 + 62028393025 = 242886^2 + 249055^2 .

It is a cyclic number.

It is not a de Polignac number, because 121022002021 - 2⁹ = 121022001509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121022001992 and 121022002010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121022002061) 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, 179557530 + ... + 179558203.

It is an arithmetic number, because the mean of its divisors is an integer number (30345279523).

Almost surely, 2^121022002021 is an apocalyptic number.

It is an amenable number.

121022002021 is a deficient number, since it is larger than the sum of its proper divisors (359116071).

121022002021 is an equidigital number, since it uses as much as digits as its factorization.

121022002021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359116070.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 121022002021 its reverse (120200220121), we get a palindrome (241222222142).

The spelling of 121022002021 in words is "one hundred twenty-one billion, twenty-two million, two thousand, twenty-one".