21223061321554 has 32 divisors (see below), whose sum is σ = 31992741998640. Its totient is φ = 10558977024000.

The previous prime is 21223061321503. The next prime is 21223061321557. The reversal of 21223061321554 is 45512316032212.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 20094106196025 + 1128955125529 = 4482645^2 + 1062523^2 .

It is not an unprimeable number, because it can be changed into a prime (21223061321557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 546108084 + ... + 546146944.

Almost surely, 2^{21223061321554} is an apocalyptic number.

21223061321554 is a deficient number, since it is larger than the sum of its proper divisors (10769680677086).

21223061321554 is a wasteful number, since it uses less digits than its factorization.

21223061321554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40926.

The product of its (nonzero) digits is 86400, while the sum is 37.

Adding to 21223061321554 its reverse (45512316032212), we get a palindrome (66735377353766).

The spelling of 21223061321554 in words is "twenty-one trillion, two hundred twenty-three billion, sixty-one million, three hundred twenty-one thousand, five hundred fifty-four".