121211012021 has 12 divisors (see below), whose sum is σ = 133240369836. Its totient is φ = 110184856320.

The previous prime is 121211012011. The next prime is 121211012051. The reversal of 121211012021 is 120210112121.

It can be written as a sum of positive squares in 2 ways, for example, as 29711416900 + 91499595121 = 172370^2 + 302489^2 .

It is not a de Polignac number, because 121211012021 - 2¹⁴ = 121210995637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121211011987 and 121211012005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121211012011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3614885 + ... + 3648261.

It is an arithmetic number, because the mean of its divisors is an integer number (11103364153).

Almost surely, 2^121211012021 is an apocalyptic number.

121211012021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121211012021 is a deficient number, since it is larger than the sum of its proper divisors (12029357815).

121211012021 is a wasteful number, since it uses less digits than its factorization.

121211012021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63412 (or 63401 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 121211012021 its reverse (120210112121), we get a palindrome (241421124142).

The spelling of 121211012021 in words is "one hundred twenty-one billion, two hundred eleven million, twelve thousand, twenty-one".