21116011213252 has 24 divisors (see below), whose sum is σ = 37237681736640. Its totient is φ = 10476684734880.

The previous prime is 21116011213249. The next prime is 21116011213279. The reversal of 21116011213252 is 25231211061112.

It is a self number, because there is not a number n which added to its sum of digits gives 21116011213252.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6220198 + ... + 8995714.

It is an arithmetic number, because the mean of its divisors is an integer number (1551570072360).

Almost surely, 2^{21116011213252} is an apocalyptic number.

It is an amenable number.

21116011213252 is a deficient number, since it is larger than the sum of its proper divisors (16121670523388).

21116011213252 is a wasteful number, since it uses less digits than its factorization.

21116011213252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2790171 (or 2790169 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 28.

Adding to 21116011213252 its reverse (25231211061112), we get a palindrome (46347222274364).

The spelling of 21116011213252 in words is "twenty-one trillion, one hundred sixteen billion, eleven million, two hundred thirteen thousand, two hundred fifty-two".