21221352510043 has 32 divisors (see below), whose sum is σ = 25248681768960. Its totient is φ = 17456822697600.

The previous prime is 21221352510011. The next prime is 21221352510079. The reversal of 21221352510043 is 34001525312212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21221352510043 - 2⁵ = 21221352510011 is a prime.

It is a super-3 number, since 3×21221352510043³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21221352509987 and 21221352510014.

It is not an unprimeable number, because it can be changed into a prime (21221352510343) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20215068 + ... + 21238918.

It is an arithmetic number, because the mean of its divisors is an integer number (789021305280).

Almost surely, 2^{21221352510043} is an apocalyptic number.

21221352510043 is a deficient number, since it is larger than the sum of its proper divisors (4027329258917).

21221352510043 is a wasteful number, since it uses less digits than its factorization.

21221352510043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1024987.

The product of its (nonzero) digits is 14400, while the sum is 31.

Adding to 21221352510043 its reverse (34001525312212), we get a palindrome (55222877822255).

The spelling of 21221352510043 in words is "twenty-one trillion, two hundred twenty-one billion, three hundred fifty-two million, five hundred ten thousand, forty-three".