67037072021 has 2 divisors, whose sum is σ = 67037072022. Its totient is φ = 67037072020.

The previous prime is 67037071967. The next prime is 67037072057. The reversal of 67037072021 is 12027073076.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66948975025 + 88096996 = 258745^2 + 9386^2 .

It is a cyclic number.

It is not a de Polignac number, because 67037072021 - 2¹⁴ = 67037055637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67037072071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33518536010 + 33518536011.

It is an arithmetic number, because the mean of its divisors is an integer number (33518536011).

Almost surely, 2^67037072021 is an apocalyptic number.

It is an amenable number.

67037072021 is a deficient number, since it is larger than the sum of its proper divisors (1).

67037072021 is an equidigital number, since it uses as much as digits as its factorization.

67037072021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24696, while the sum is 35.

The spelling of 67037072021 in words is "sixty-seven billion, thirty-seven million, seventy-two thousand, twenty-one".