21144045454 has 8 divisors (see below), whose sum is σ = 36246935088. Its totient is φ = 9061733760.

The previous prime is 21144045451. The next prime is 21144045457. The reversal of 21144045454 is 45454044112.

It is an interprime number because it is at equal distance from previous prime (21144045451) and next prime (21144045457).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21144045454² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21144045451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 755144467 + ... + 755144494.

It is an arithmetic number, because the mean of its divisors is an integer number (4530866886).

Almost surely, 2^21144045454 is an apocalyptic number.

21144045454 is a deficient number, since it is larger than the sum of its proper divisors (15102889634).

21144045454 is a wasteful number, since it uses less digits than its factorization.

21144045454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1510288970.

The product of its (nonzero) digits is 51200, while the sum is 34.

Adding to 21144045454 its reverse (45454044112), we get a palindrome (66598089566).

The spelling of 21144045454 in words is "twenty-one billion, one hundred forty-four million, forty-five thousand, four hundred fifty-four".