40213124402021 has 4 divisors (see below), whose sum is σ = 40217130900492. Its totient is φ = 40209117903552.

The previous prime is 40213124401987. The next prime is 40213124402047. The reversal of 40213124402021 is 12020442131204.

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 17052679401121 + 23160445000900 = 4129489^2 + 4812530^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40213124402021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40213124402071) 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, 2003234180 + ... + 2003254253.

It is an arithmetic number, because the mean of its divisors is an integer number (10054282725123).

Almost surely, 2^{40213124402021} is an apocalyptic number.

It is an amenable number.

40213124402021 is a deficient number, since it is larger than the sum of its proper divisors (4006498471).

40213124402021 is a wasteful number, since it uses less digits than its factorization.

40213124402021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4006498470.

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 40213124402021 its reverse (12020442131204), we get a palindrome (52233566533225).

The spelling of 40213124402021 in words is "forty trillion, two hundred thirteen billion, one hundred twenty-four million, four hundred two thousand, twenty-one".