40213053521 has 2 divisors, whose sum is σ = 40213053522. Its totient is φ = 40213053520.

The previous prime is 40213053479. The next prime is 40213053541. The reversal of 40213053521 is 12535031204.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33503641600 + 6709411921 = 183040^2 + 81911^2 .

It is a cyclic number.

It is not a de Polignac number, because 40213053521 - 2⁶ = 40213053457 is a prime.

It is not a weakly prime, because it can be changed into another prime (40213053541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20106526760 + 20106526761.

It is an arithmetic number, because the mean of its divisors is an integer number (20106526761).

Almost surely, 2^40213053521 is an apocalyptic number.

It is an amenable number.

40213053521 is a deficient number, since it is larger than the sum of its proper divisors (1).

40213053521 is an equidigital number, since it uses as much as digits as its factorization.

40213053521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 26.

Adding to 40213053521 its reverse (12535031204), we get a palindrome (52748084725).

The spelling of 40213053521 in words is "forty billion, two hundred thirteen million, fifty-three thousand, five hundred twenty-one".