21154534102012 has 12 divisors (see below), whose sum is σ = 37020783252096. Its totient is φ = 10577167458560.

The previous prime is 21154534101991. The next prime is 21154534102043. The reversal of 21154534102012 is 21020143545112.

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, 24419164 + ... + 25270627.

It is an arithmetic number, because the mean of its divisors is an integer number (3085065271008).

Almost surely, 2^{21154534102012} is an apocalyptic number.

It is an amenable number.

21154534102012 is a deficient number, since it is larger than the sum of its proper divisors (15866249150084).

21154534102012 is a wasteful number, since it uses less digits than its factorization.

21154534102012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49796228 (or 49796226 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 31.

Adding to 21154534102012 its reverse (21020143545112), we get a palindrome (42174677647124).

The spelling of 21154534102012 in words is "twenty-one trillion, one hundred fifty-four billion, five hundred thirty-four million, one hundred two thousand, twelve".