21355346305454 has 16 divisors (see below), whose sum is σ = 36613294005888. Its totient is φ = 9151259046072.

The previous prime is 21355346305333. The next prime is 21355346305511. The reversal of 21355346305454 is 45450364355312.

It is a super-2 number, since 2×21355346305454² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85890404 + ... + 86138679.

It is an arithmetic number, because the mean of its divisors is an integer number (2288330875368).

Almost surely, 2^{21355346305454} is an apocalyptic number.

21355346305454 is a deficient number, since it is larger than the sum of its proper divisors (15257947700434).

21355346305454 is a wasteful number, since it uses less digits than its factorization.

21355346305454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172037959.

The product of its (nonzero) digits is 12960000, while the sum is 50.

The spelling of 21355346305454 in words is "twenty-one trillion, three hundred fifty-five billion, three hundred forty-six million, three hundred five thousand, four hundred fifty-four".