21111302253 has 8 divisors (see below), whose sum is σ = 29804191488. Its totient is φ = 13246307264.

The previous prime is 21111302243. The next prime is 21111302257. The reversal of 21111302253 is 35220311112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21111302253 - 2¹² = 21111298157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111302257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 206973501 + ... + 206973602.

It is an arithmetic number, because the mean of its divisors is an integer number (3725523936).

Almost surely, 2^21111302253 is an apocalyptic number.

It is an amenable number.

21111302253 is a deficient number, since it is larger than the sum of its proper divisors (8692889235).

21111302253 is a wasteful number, since it uses less digits than its factorization.

21111302253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413947123.

The product of its (nonzero) digits is 360, while the sum is 21.

Adding to 21111302253 its reverse (35220311112), we get a palindrome (56331613365).

The spelling of 21111302253 in words is "twenty-one billion, one hundred eleven million, three hundred two thousand, two hundred fifty-three".