21116011213253 has 16 divisors (see below), whose sum is σ = 23266746044352. Its totient is φ = 19003842000000.

The previous prime is 21116011213249. The next prime is 21116011213279. The reversal of 21116011213253 is 35231211061112.

It is a happy number.

It is not a de Polignac number, because 21116011213253 - 2² = 21116011213249 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21116011213553) 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, 7349753 + ... + 9810753.

It is an arithmetic number, because the mean of its divisors is an integer number (1454171627772).

Almost surely, 2^{21116011213253} is an apocalyptic number.

It is an amenable number.

21116011213253 is a deficient number, since it is larger than the sum of its proper divisors (2150734831099).

21116011213253 is a wasteful number, since it uses less digits than its factorization.

21116011213253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2468836.

The product of its (nonzero) digits is 2160, while the sum is 29.

Adding to 21116011213253 its reverse (35231211061112), we get a palindrome (56347222274365).

The spelling of 21116011213253 in words is "twenty-one trillion, one hundred sixteen billion, eleven million, two hundred thirteen thousand, two hundred fifty-three".