21477216000 has 576 divisors, whose sum is σ = 76037584896. Its totient is φ = 5361664000.

The previous prime is 21477215971. The next prime is 21477216031. The reversal of 21477216000 is 61277412.

It is a super-2 number, since 2×21477216000² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 156767932 + ... + 156768068.

It is an arithmetic number, because the mean of its divisors is an integer number (132009696).

Almost surely, 2^21477216000 is an apocalyptic number.

21477216000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21477216000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38018792448).

21477216000 is an abundant number, since it is smaller than the sum of its proper divisors (54560368896).

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

21477216000 is a wasteful number, since it uses less digits than its factorization.

21477216000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265 (or 241 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 30.

The spelling of 21477216000 in words is "twenty-one billion, four hundred seventy-seven million, two hundred sixteen thousand".