21154553054 has 8 divisors (see below), whose sum is σ = 32166512400. Its totient is φ = 10432382256.

The previous prime is 21154553053. The next prime is 21154553099. The reversal of 21154553054 is 45035545112.

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

It is a super-2 number, since 2×21154553054² (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 (21154553053) 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, 72446954 + ... + 72447245.

It is an arithmetic number, because the mean of its divisors is an integer number (4020814050).

Almost surely, 2^21154553054 is an apocalyptic number.

21154553054 is a deficient number, since it is larger than the sum of its proper divisors (11011959346).

21154553054 is a wasteful number, since it uses less digits than its factorization.

21154553054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144894274.

The product of its (nonzero) digits is 60000, while the sum is 35.

The spelling of 21154553054 in words is "twenty-one billion, one hundred fifty-four million, five hundred fifty-three thousand, fifty-four".