40100121 has 6 divisors (see below), whose sum is σ = 57922410. Its totient is φ = 26733408.

The previous prime is 40100113. The next prime is 40100129. The reversal of 40100121 is 12100104.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (40100113) and next prime (40100129).

It can be written as a sum of positive squares in only one way, i.e., 24890121 + 15210000 = 4989^2 + 3900^2 .

It is not a de Polignac number, because 40100121 - 2³ = 40100113 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 4455569 = 40100121 / (4 + 0 + 1 + 0 + 0 + 1 + 2 + 1).

It is not an unprimeable number, because it can be changed into a prime (40100129) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2227776 + ... + 2227793.

It is an arithmetic number, because the mean of its divisors is an integer number (9653735).

Almost surely, 2^40100121 is an apocalyptic number.

It is an amenable number.

40100121 is a deficient number, since it is larger than the sum of its proper divisors (17822289).

40100121 is a wasteful number, since it uses less digits than its factorization.

40100121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4455575 (or 4455572 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 40100121 is about 6332.4656335428. The cubic root of 40100121 is about 342.2802924304.

Adding to 40100121 its reverse (12100104), we get a palindrome (52200225).

The spelling of 40100121 in words is "forty million, one hundred thousand, one hundred twenty-one".