21152516223011 has 4 divisors (see below), whose sum is σ = 21173032728624. Its totient is φ = 21131999717400.

The previous prime is 21152516223001. The next prime is 21152516223037. The reversal of 21152516223011 is 11032261525112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21152516223011 - 2⁴² = 16754469711907 is a prime.

It is a super-2 number, since 2×21152516223011² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21152516223001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10258251260 + ... + 10258253321.

It is an arithmetic number, because the mean of its divisors is an integer number (5293258182156).

Almost surely, 2^{21152516223011} is an apocalyptic number.

21152516223011 is a deficient number, since it is larger than the sum of its proper divisors (20516505613).

21152516223011 is a wasteful number, since it uses less digits than its factorization.

21152516223011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20516505612.

The product of its (nonzero) digits is 7200, while the sum is 32.

Adding to 21152516223011 its reverse (11032261525112), we get a palindrome (32184777748123).

The spelling of 21152516223011 in words is "twenty-one trillion, one hundred fifty-two billion, five hundred sixteen million, two hundred twenty-three thousand, eleven".