121000005 has 48 divisors (see below), whose sum is σ = 240724224. Its totient is φ = 55077120.

The previous prime is 121000003. The next prime is 121000049. The reversal of 121000005 is 500000121.

It is a happy number.

It is not a de Polignac number, because 121000005 - 2¹ = 121000003 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121000003) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 87832 + ... + 89198.

It is an arithmetic number, because the mean of its divisors is an integer number (5015088).

Almost surely, 2^121000005 is an apocalyptic number.

121000005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121000005 is a deficient number, since it is larger than the sum of its proper divisors (119724219).

121000005 is a wasteful number, since it uses less digits than its factorization.

121000005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1666 (or 1663 counting only the distinct ones).

The product of its (nonzero) digits is 10, while the sum is 9.

The square root of 121000005 is about 11000.0002272727. Note that the first 3 decimals coincide. The cubic root of 121000005 is about 494.6087511377.

Adding to 121000005 its reverse (500000121), we get a palindrome (621000126).

The spelling of 121000005 in words is "one hundred twenty-one million, five", and thus it is an aban number.