21151443443043 has 4 divisors (see below), whose sum is σ = 28201924590728. Its totient is φ = 14100962295360.

The previous prime is 21151443443029. The next prime is 21151443443069. The reversal of 21151443443043 is 34034434415112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21151443443043 - 2⁶ = 21151443442979 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21151443442992 and 21151443443010.

It is not an unprimeable number, because it can be changed into a prime (21151443448043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3525240573838 + ... + 3525240573843.

It is an arithmetic number, because the mean of its divisors is an integer number (7050481147682).

Almost surely, 2^{21151443443043} is an apocalyptic number.

21151443443043 is a deficient number, since it is larger than the sum of its proper divisors (7050481147685).

21151443443043 is an equidigital number, since it uses as much as digits as its factorization.

21151443443043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7050481147684.

The product of its (nonzero) digits is 276480, while the sum is 39.

Adding to 21151443443043 its reverse (34034434415112), we get a palindrome (55185877858155).

The spelling of 21151443443043 in words is "twenty-one trillion, one hundred fifty-one billion, four hundred forty-three million, four hundred forty-three thousand, forty-three".