21321221401143 has 16 divisors (see below), whose sum is σ = 31587367112160. Its totient is φ = 14213980001088.

The previous prime is 21321221401121. The next prime is 21321221401153. The reversal of 21321221401143 is 34110412212312.

21321221401143 is a `hidden beast` number, since 2 + 1 + 3 + 21 + 221 + 401 + 14 + 3 = 666.

It is not a de Polignac number, because 21321221401143 - 2³⁴ = 21304041531959 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21321221401153) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2301630 + ... + 6923867.

It is an arithmetic number, because the mean of its divisors is an integer number (1974210444510).

Almost surely, 2^{21321221401143} is an apocalyptic number.

21321221401143 is a deficient number, since it is larger than the sum of its proper divisors (10266145711017).

21321221401143 is an equidigital number, since it uses as much as digits as its factorization.

21321221401143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9311103 (or 9311097 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

Adding to 21321221401143 its reverse (34110412212312), we get a palindrome (55431633613455).

The spelling of 21321221401143 in words is "twenty-one trillion, three hundred twenty-one billion, two hundred twenty-one million, four hundred one thousand, one hundred forty-three".