21554314212 has 48 divisors (see below), whose sum is σ = 53334977472. Its totient is φ = 6751580160.

The previous prime is 21554314211. The next prime is 21554314217. The reversal of 21554314212 is 21241345512.

It is a super-2 number, since 2×21554314212² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21554314212.

It is not an unprimeable number, because it can be changed into a prime (21554314211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49012 + ... + 213332.

It is an arithmetic number, because the mean of its divisors is an integer number (1111145364).

Almost surely, 2^21554314212 is an apocalyptic number.

It is an amenable number.

21554314212 is an abundant number, since it is smaller than the sum of its proper divisors (31780663260).

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

21554314212 is a wasteful number, since it uses less digits than its factorization.

21554314212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164988 (or 164986 counting only the distinct ones).

The product of its digits is 9600, while the sum is 30.

Adding to 21554314212 its reverse (21241345512), we get a palindrome (42795659724).

The spelling of 21554314212 in words is "twenty-one billion, five hundred fifty-four million, three hundred fourteen thousand, two hundred twelve".