121021211021 has 8 divisors (see below), whose sum is σ = 121101697080. Its totient is φ = 120940756992.

The previous prime is 121021210979. The next prime is 121021211033. The reversal of 121021211021 is 120112120121.

It can be written as a sum of positive squares in 4 ways, for example, as 57962970025 + 63058240996 = 240755^2 + 251114^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121021211021 - 2¹⁸ = 121020948877 is a prime.

It is a super-2 number, since 2×121021211021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121021210987 and 121021211005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121021211321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17970971 + ... + 17977703.

It is an arithmetic number, because the mean of its divisors is an integer number (15137712135).

Almost surely, 2^121021211021 is an apocalyptic number.

It is an amenable number.

121021211021 is a deficient number, since it is larger than the sum of its proper divisors (80486059).

121021211021 is an equidigital number, since it uses as much as digits as its factorization.

121021211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16015.

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

Adding to 121021211021 its reverse (120112120121), we get a palindrome (241133331142).

The spelling of 121021211021 in words is "one hundred twenty-one billion, twenty-one million, two hundred eleven thousand, twenty-one".