40102121 has 4 divisors (see below), whose sum is σ = 40247172. Its totient is φ = 39957072.

The previous prime is 40102109. The next prime is 40102147. The reversal of 40102121 is 12120104.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13424896 + 26677225 = 3664^2 + 5165^2 .

It is a cyclic number.

It is not a de Polignac number, because 40102121 - 2¹⁴ = 40085737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40102171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72110 + ... + 72663.

It is an arithmetic number, because the mean of its divisors is an integer number (10061793).

Almost surely, 2^40102121 is an apocalyptic number.

It is an amenable number.

40102121 is a deficient number, since it is larger than the sum of its proper divisors (145051).

40102121 is a wasteful number, since it uses less digits than its factorization.

40102121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145050.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 40102121 is about 6332.6235479460. The cubic root of 40102121 is about 342.2859827640.

Adding to 40102121 its reverse (12120104), we get a palindrome (52222225).

The spelling of 40102121 in words is "forty million, one hundred two thousand, one hundred twenty-one".