40102921 has 2 divisors, whose sum is σ = 40102922. Its totient is φ = 40102920.

The previous prime is 40102913. The next prime is 40102963. The reversal of 40102921 is 12920104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30647296 + 9455625 = 5536^2 + 3075^2 .

It is a cyclic number.

It is not a de Polignac number, because 40102921 - 2³ = 40102913 is a prime.

It is not a weakly prime, because it can be changed into another prime (40102721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20051460 + 20051461.

It is an arithmetic number, because the mean of its divisors is an integer number (20051461).

Almost surely, 2^40102921 is an apocalyptic number.

It is an amenable number.

40102921 is a deficient number, since it is larger than the sum of its proper divisors (1).

40102921 is an equidigital number, since it uses as much as digits as its factorization.

40102921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 40102921 is about 6332.6867126047. The cubic root of 40102921 is about 342.2882588445.

The spelling of 40102921 in words is "forty million, one hundred two thousand, nine hundred twenty-one".