40201821 has 24 divisors (see below), whose sum is σ = 67077504. Its totient is φ = 22930560.

The previous prime is 40201817. The next prime is 40201829. The reversal of 40201821 is 12810204.

It is not a de Polignac number, because 40201821 - 2² = 40201817 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40201794 and 40201803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40201829) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10261 + ... + 13626.

It is an arithmetic number, because the mean of its divisors is an integer number (2794896).

Almost surely, 2^40201821 is an apocalyptic number.

It is an amenable number.

40201821 is a deficient number, since it is larger than the sum of its proper divisors (26875683).

40201821 is a wasteful number, since it uses less digits than its factorization.

40201821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23921 (or 23918 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 40201821 is about 6340.4905961605. The cubic root of 40201821 is about 342.5694064324.

The spelling of 40201821 in words is "forty million, two hundred one thousand, eight hundred twenty-one".