21443102012155 has 4 divisors (see below), whose sum is σ = 25731722414592. Its totient is φ = 17154481609720.

The previous prime is 21443102012119. The next prime is 21443102012161. The reversal of 21443102012155 is 55121020134412.

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

It is not a de Polignac number, because 21443102012155 - 2⁷ = 21443102012027 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2144310201211 + ... + 2144310201220.

It is an arithmetic number, because the mean of its divisors is an integer number (6432930603648).

Almost surely, 2^{21443102012155} is an apocalyptic number.

21443102012155 is a deficient number, since it is larger than the sum of its proper divisors (4288620402437).

21443102012155 is an equidigital number, since it uses as much as digits as its factorization.

21443102012155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4288620402436.

The product of its (nonzero) digits is 9600, while the sum is 31.

Adding to 21443102012155 its reverse (55121020134412), we get a palindrome (76564122146567).

The spelling of 21443102012155 in words is "twenty-one trillion, four hundred forty-three billion, one hundred two million, twelve thousand, one hundred fifty-five".