1000121243 has 16 divisors (see below), whose sum is σ = 1113171936. Its totient is φ = 890922240.

The previous prime is 1000121197. The next prime is 1000121257. The reversal of 1000121243 is 3421210001.

It is a cyclic number.

It is not a de Polignac number, because 1000121243 - 2⁶ = 1000121179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1000120243) 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, 122105 + ... + 130037.

It is an arithmetic number, because the mean of its divisors is an integer number (69573246).

Almost surely, 2^1000121243 is an apocalyptic number.

1000121243 is a deficient number, since it is larger than the sum of its proper divisors (113050693).

1000121243 is a wasteful number, since it uses less digits than its factorization.

1000121243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8174.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 1000121243 is about 31624.6935637328. The cubic root of 1000121243 is about 1000.0404127001.

Adding to 1000121243 its reverse (3421210001), we get a palindrome (4421331244).

The spelling of 1000121243 in words is "one billion, one hundred twenty-one thousand, two hundred forty-three".