21035533442212 has 6 divisors (see below), whose sum is σ = 36812183523878. Its totient is φ = 10517766721104.

The previous prime is 21035533442173. The next prime is 21035533442219. The reversal of 21035533442212 is 21224433553012.

It can be written as a sum of positive squares in only one way, i.e., 16386093504676 + 4649439937536 = 4047974^2 + 2156256^2 .

It is not an unprimeable number, because it can be changed into a prime (21035533442219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2629441680273 + ... + 2629441680280.

Almost surely, 2^{21035533442212} is an apocalyptic number.

It is an amenable number.

21035533442212 is a deficient number, since it is larger than the sum of its proper divisors (15776650081666).

21035533442212 is a wasteful number, since it uses less digits than its factorization.

21035533442212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5258883360557 (or 5258883360555 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 37.

Adding to 21035533442212 its reverse (21224433553012), we get a palindrome (42259966995224).

The spelling of 21035533442212 in words is "twenty-one trillion, thirty-five billion, five hundred thirty-three million, four hundred forty-two thousand, two hundred twelve".