21023432011 has 8 divisors (see below), whose sum is σ = 21236338944. Its totient is φ = 20810829480.

The previous prime is 21023431969. The next prime is 21023432021. The reversal of 21023432011 is 11023432012.

It is a happy number.

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 21023432011 - 2²³ = 21015043403 is a prime.

It is a super-2 number, since 2×21023432011² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21023432011.

It is not an unprimeable number, because it can be changed into a prime (21023432021) 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, 64026 + ... + 214816.

It is an arithmetic number, because the mean of its divisors is an integer number (2654542368).

Almost surely, 2^21023432011 is an apocalyptic number.

21023432011 is a deficient number, since it is larger than the sum of its proper divisors (212906933).

21023432011 is a wasteful number, since it uses less digits than its factorization.

21023432011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152201.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21023432011 its reverse (11023432012), we get a palindrome (32046864023).

Subtracting from 21023432011 its reverse (11023432012), we obtain a palindrome (9999999999).

The spelling of 21023432011 in words is "twenty-one billion, twenty-three million, four hundred thirty-two thousand, eleven".