21551501154112 has 28 divisors (see below), whose sum is σ = 42769110624676. Its totient is φ = 10775032335360.

The previous prime is 21551501154101. The next prime is 21551501154163. The reversal of 21551501154112 is 21145110515512.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 6035591081536 + 15515910072576 = 2456744^2 + 3939024^2 .

It is a congruent number.

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, 10254189 + ... + 12175852.

Almost surely, 2^{21551501154112} is an apocalyptic number.

It is an amenable number.

21551501154112 is a deficient number, since it is larger than the sum of its proper divisors (21217609470564).

21551501154112 is a wasteful number, since it uses less digits than its factorization.

21551501154112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22445066 (or 22445056 counting only the distinct ones).

The product of its (nonzero) digits is 10000, while the sum is 34.

Adding to 21551501154112 its reverse (21145110515512), we get a palindrome (42696611669624).

The spelling of 21551501154112 in words is "twenty-one trillion, five hundred fifty-one billion, five hundred one million, one hundred fifty-four thousand, one hundred twelve".