121121001005 has 8 divisors (see below), whose sum is σ = 153894919032. Its totient is φ = 91196988928.

The previous prime is 121121000993. The next prime is 121121001007. The reversal of 121121001005 is 500100121121.

It can be written as a sum of positive squares in 4 ways, for example, as 21690514729 + 99430486276 = 147277^2 + 315326^2 .

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 121121001005 - 2²⁸ = 120852565549 is a prime.

It is a super-2 number, since 2×121121001005² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121121001007) 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, 712476392 + ... + 712476561.

It is an arithmetic number, because the mean of its divisors is an integer number (19236864879).

Almost surely, 2^121121001005 is an apocalyptic number.

It is an amenable number.

121121001005 is a deficient number, since it is larger than the sum of its proper divisors (32773918027).

121121001005 is a wasteful number, since it uses less digits than its factorization.

121121001005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1424952975.

The product of its (nonzero) digits is 20, while the sum is 14.

Adding to 121121001005 its reverse (500100121121), we get a palindrome (621221122126).

The spelling of 121121001005 in words is "one hundred twenty-one billion, one hundred twenty-one million, one thousand, five".