121211021005 has 8 divisors (see below), whose sum is σ = 145455989400. Its totient is φ = 96966974016.

The previous prime is 121211020981. The next prime is 121211021011. The reversal of 121211021005 is 500120112121.

It can be written as a sum of positive squares in 4 ways, for example, as 55167674884 + 66043346121 = 234878^2 + 256989^2 .

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 121211021005 - 2³¹ = 119063537357 is a prime.

It is a super-2 number, since 2×121211021005² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 121211021005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102891 + ... + 502999.

It is an arithmetic number, because the mean of its divisors is an integer number (18181998675).

Almost surely, 2^121211021005 is an apocalyptic number.

It is an amenable number.

121211021005 is a deficient number, since it is larger than the sum of its proper divisors (24244968395).

121211021005 is an equidigital number, since it uses as much as digits as its factorization.

121211021005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460703.

The product of its (nonzero) digits is 40, while the sum is 16.

Adding to 121211021005 its reverse (500120112121), we get a palindrome (621331133126).

The spelling of 121211021005 in words is "one hundred twenty-one billion, two hundred eleven million, twenty-one thousand, five".