21345320443402 has 32 divisors (see below), whose sum is σ = 34014081911040. Its totient is φ = 10011471229440.

The previous prime is 21345320443373. The next prime is 21345320443439. The reversal of 21345320443402 is 20434402354312.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 179568127 + ... + 179686957.

It is an arithmetic number, because the mean of its divisors is an integer number (1062940059720).

Almost surely, 2^{21345320443402} is an apocalyptic number.

21345320443402 is a deficient number, since it is larger than the sum of its proper divisors (12668761467638).

21345320443402 is a wasteful number, since it uses less digits than its factorization.

21345320443402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136366.

The product of its (nonzero) digits is 276480, while the sum is 37.

Adding to 21345320443402 its reverse (20434402354312), we get a palindrome (41779722797714).

The spelling of 21345320443402 in words is "twenty-one trillion, three hundred forty-five billion, three hundred twenty million, four hundred forty-three thousand, four hundred two".