21123400443342 has 48 divisors (see below), whose sum is σ = 44217594831312. Its totient is φ = 6723240929920.

The previous prime is 21123400443329. The next prime is 21123400443407. The reversal of 21123400443342 is 24334400432112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18892413 + ... + 19979240.

It is an arithmetic number, because the mean of its divisors is an integer number (921199892319).

Almost surely, 2^{21123400443342} is an apocalyptic number.

21123400443342 is an abundant number, since it is smaller than the sum of its proper divisors (23094194387970).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21123400443342 is a wasteful number, since it uses less digits than its factorization.

21123400443342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38871793 (or 38871746 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 33.

Adding to 21123400443342 its reverse (24334400432112), we get a palindrome (45457800875454).

The spelling of 21123400443342 in words is "twenty-one trillion, one hundred twenty-three billion, four hundred million, four hundred forty-three thousand, three hundred forty-two".