121121120005 has 16 divisors (see below), whose sum is σ = 159201799920. Its totient is φ = 88052349952.

The previous prime is 121121119981. The next prime is 121121120009. The reversal of 121121120005 is 500021121121.

It can be written as a sum of positive squares in 8 ways, for example, as 1105296516 + 120015823489 = 33246^2 + 346433^2 .

It is a cyclic number.

It is not a de Polignac number, because 121121120005 - 2²¹ = 121119022853 is a prime.

It is a super-2 number, since 2×121121120005² (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 (121121120009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24565714 + ... + 24570643.

It is an arithmetic number, because the mean of its divisors is an integer number (9950112495).

Almost surely, 2^121121120005 is an apocalyptic number.

It is an amenable number.

121121120005 is a deficient number, since it is larger than the sum of its proper divisors (38080679915).

121121120005 is a wasteful number, since it uses less digits than its factorization.

121121120005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49136408.

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

Adding to 121121120005 its reverse (500021121121), we get a palindrome (621142241126).

The spelling of 121121120005 in words is "one hundred twenty-one billion, one hundred twenty-one million, one hundred twenty thousand, five".