21355355400734 has 4 divisors (see below), whose sum is σ = 32033033101104. Its totient is φ = 10677677700366.

The previous prime is 21355355400671. The next prime is 21355355400779. The reversal of 21355355400734 is 43700455355312.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5338838850182 + ... + 5338838850185.

It is an arithmetic number, because the mean of its divisors is an integer number (8008258275276).

Almost surely, 2^{21355355400734} is an apocalyptic number.

21355355400734 is a deficient number, since it is larger than the sum of its proper divisors (10677677700370).

21355355400734 is a wasteful number, since it uses less digits than its factorization.

21355355400734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10677677700369.

The product of its (nonzero) digits is 3780000, while the sum is 47.

The spelling of 21355355400734 in words is "twenty-one trillion, three hundred fifty-five billion, three hundred fifty-five million, four hundred thousand, seven hundred thirty-four".