121002021121 has 4 divisors (see below), whose sum is σ = 121011470272. Its totient is φ = 120992571972.

The previous prime is 121002021079. The next prime is 121002021131. The reversal of 121002021121 is 121120200121.

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: 121120200121 = 18397 ⋅6583693.

It is a cyclic number.

It is not a de Polignac number, because 121002021121 - 2⁹ = 121002020609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121002021131) 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, 4705341 + ... + 4730986.

It is an arithmetic number, because the mean of its divisors is an integer number (30252867568).

Almost surely, 2^121002021121 is an apocalyptic number.

It is an amenable number.

121002021121 is a deficient number, since it is larger than the sum of its proper divisors (9449151).

121002021121 is an equidigital number, since it uses as much as digits as its factorization.

121002021121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9449150.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 121002021121 its reverse (121120200121), we get a palindrome (242122221242).

The spelling of 121002021121 in words is "one hundred twenty-one billion, two million, twenty-one thousand, one hundred twenty-one".