21354545440044 has 48 divisors (see below), whose sum is σ = 55363959705600. Its totient is φ = 7118140236048.

The previous prime is 21354545439967. The next prime is 21354545440099. The reversal of 21354545440044 is 44004454545312.

21354545440044 is a `hidden beast` number, since 2 + 1 + 3 + 54 + 54 + 544 + 0 + 0 + 4 + 4 = 666.

It is a super-2 number, since 2×21354545440044² (a number of 27 digits) contains 22 as substring.

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, 22103269 + ... + 23049155.

It is an arithmetic number, because the mean of its divisors is an integer number (1153415827200).

Almost surely, 2^{21354545440044} is an apocalyptic number.

It is an amenable number.

21354545440044 is an abundant number, since it is smaller than the sum of its proper divisors (34009414265556).

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

21354545440044 is a wasteful number, since it uses less digits than its factorization.

21354545440044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1154939 (or 1154931 counting only the distinct ones).

The product of its (nonzero) digits is 3072000, while the sum is 45.

Adding to 21354545440044 its reverse (44004454545312), we get a palindrome (65358999985356).

The spelling of 21354545440044 in words is "twenty-one trillion, three hundred fifty-four billion, five hundred forty-five million, four hundred forty thousand, forty-four".