21550400202152 has 16 divisors (see below), whose sum is σ = 40407097400160. Its totient is φ = 10775174228784.

The previous prime is 21550400202127. The next prime is 21550400202173. The reversal of 21550400202152 is 25120200405512.

It is a happy number.

It is a super-2 number, since 2×21550400202152² (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 3 ways as a sum of consecutive naturals, for example, 569093 + ... + 6589739.

It is an arithmetic number, because the mean of its divisors is an integer number (2525443587510).

Almost surely, 2^{21550400202152} is an apocalyptic number.

It is an amenable number.

21550400202152 is a deficient number, since it is larger than the sum of its proper divisors (18856697198008).

21550400202152 is a wasteful number, since it uses less digits than its factorization.

21550400202152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6468080 (or 6468076 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 29.

Adding to 21550400202152 its reverse (25120200405512), we get a palindrome (46670600607664).

The spelling of 21550400202152 in words is "twenty-one trillion, five hundred fifty billion, four hundred million, two hundred two thousand, one hundred fifty-two".