21344345454 has 32 divisors (see below), whose sum is σ = 43124783616. Its totient is φ = 7042400960.

The previous prime is 21344345443. The next prime is 21344345471. The reversal of 21344345454 is 45454344312.

It is a super-2 number, since 2×21344345454² (a number of 21 digits) contains 22 as substring.

It is a congruent 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, 247819 + ... + 322649.

It is an arithmetic number, because the mean of its divisors is an integer number (1347649488).

Almost surely, 2^21344345454 is an apocalyptic number.

21344345454 is an abundant number, since it is smaller than the sum of its proper divisors (21780438162).

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

21344345454 is a wasteful number, since it uses less digits than its factorization.

21344345454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75320.

The product of its digits is 460800, while the sum is 39.

Adding to 21344345454 its reverse (45454344312), we get a palindrome (66798689766).

The spelling of 21344345454 in words is "twenty-one billion, three hundred forty-four million, three hundred forty-five thousand, four hundred fifty-four".