21225102640055 has 16 divisors (see below), whose sum is σ = 26969488674624. Its totient is φ = 15980588290560.

The previous prime is 21225102640051. The next prime is 21225102640057. The reversal of 21225102640055 is 55004620152212.

It is not a de Polignac number, because 21225102640055 - 2² = 21225102640051 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21225102639997 and 21225102640024.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21225102640051) 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, 3140852 + ... + 7232921.

It is an arithmetic number, because the mean of its divisors is an integer number (1685593042164).

Almost surely, 2^{21225102640055} is an apocalyptic number.

21225102640055 is a deficient number, since it is larger than the sum of its proper divisors (5744386034569).

21225102640055 is a wasteful number, since it uses less digits than its factorization.

21225102640055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10397866.

The product of its (nonzero) digits is 48000, while the sum is 35.

Adding to 21225102640055 its reverse (55004620152212), we get a palindrome (76229722792267).

The spelling of 21225102640055 in words is "twenty-one trillion, two hundred twenty-five billion, one hundred two million, six hundred forty thousand, fifty-five".