40201021 has 6 divisors (see below), whose sum is σ = 46764510. Its totient is φ = 34457976.

The previous prime is 40200997. The next prime is 40201043. The reversal of 40201021 is 12010204.

It can be written as a sum of positive squares in only one way, i.e., 29052100 + 11148921 = 5390^2 + 3339^2 .

It is not a de Polignac number, because 40201021 - 2²¹ = 38103869 is a prime.

It is a super-2 number, since 2×40201021² = 3232244178884882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40200989 and 40201007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40201061) 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, 410166 + ... + 410263.

It is an arithmetic number, because the mean of its divisors is an integer number (7794085).

Almost surely, 2^40201021 is an apocalyptic number.

It is an amenable number.

40201021 is a deficient number, since it is larger than the sum of its proper divisors (6563489).

40201021 is an equidigital number, since it uses as much as digits as its factorization.

40201021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 820443 (or 820436 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 40201021 is about 6340.4275092457. The cubic root of 40201021 is about 342.5671340864.

Adding to 40201021 its reverse (12010204), we get a palindrome (52211225).

It can be divided in two parts, 4020 and 1021, that added together give a square (5041 = 71²).

The spelling of 40201021 in words is "forty million, two hundred one thousand, twenty-one".