40020167223521 has 2 divisors, whose sum is σ = 40020167223522. Its totient is φ = 40020167223520.

The previous prime is 40020167223497. The next prime is 40020167223649. The reversal of 40020167223521 is 12532276102004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39953321706496 + 66845517025 = 6320864^2 + 258545^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40020167223521 is a prime.

It is a super-2 number, since 2×40020167223521² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40020167223721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20010083611760 + 20010083611761.

It is an arithmetic number, because the mean of its divisors is an integer number (20010083611761).

Almost surely, 2^{40020167223521} is an apocalyptic number.

It is an amenable number.

40020167223521 is a deficient number, since it is larger than the sum of its proper divisors (1).

40020167223521 is an equidigital number, since it uses as much as digits as its factorization.

40020167223521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 35.

The spelling of 40020167223521 in words is "forty trillion, twenty billion, one hundred sixty-seven million, two hundred twenty-three thousand, five hundred twenty-one".