21021136053 has 16 divisors (see below), whose sum is σ = 28936223232. Its totient is φ = 13560192000.

The previous prime is 21021136043. The next prime is 21021136067. The reversal of 21021136053 is 35063112012.

It is not a de Polignac number, because 21021136053 - 2²⁶ = 20954027189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021136043) 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, 1166673 + ... + 1184553.

It is an arithmetic number, because the mean of its divisors is an integer number (1808513952).

Almost surely, 2^21021136053 is an apocalyptic number.

It is an amenable number.

21021136053 is a deficient number, since it is larger than the sum of its proper divisors (7915087179).

21021136053 is a wasteful number, since it uses less digits than its factorization.

21021136053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30556.

The product of its (nonzero) digits is 1080, while the sum is 24.

Adding to 21021136053 its reverse (35063112012), we get a palindrome (56084248065).

The spelling of 21021136053 in words is "twenty-one billion, twenty-one million, one hundred thirty-six thousand, fifty-three".