21152430211 has 32 divisors (see below), whose sum is σ = 24140329920. Its totient is φ = 18362764800.

The previous prime is 21152430203. The next prime is 21152430283. The reversal of 21152430211 is 11203425112.

It is a cyclic number.

It is not a de Polignac number, because 21152430211 - 2³ = 21152430203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21152430811) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19786585 + ... + 19787653.

It is an arithmetic number, because the mean of its divisors is an integer number (754385310).

Almost surely, 2^21152430211 is an apocalyptic number.

21152430211 is a deficient number, since it is larger than the sum of its proper divisors (2987899709).

21152430211 is a wasteful number, since it uses less digits than its factorization.

21152430211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1975.

The product of its (nonzero) digits is 480, while the sum is 22.

Adding to 21152430211 its reverse (11203425112), we get a palindrome (32355855323).

The spelling of 21152430211 in words is "twenty-one billion, one hundred fifty-two million, four hundred thirty thousand, two hundred eleven".