21211021023 has 32 divisors (see below), whose sum is σ = 30386534400. Its totient is φ = 13113325056.

The previous prime is 21211021003. The next prime is 21211021081. The reversal of 21211021023 is 32012011212.

It is not a de Polignac number, because 21211021023 - 2¹³ = 21211012831 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21211020993 and 21211021011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211021003) 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, 2045590 + ... + 2055932.

It is an arithmetic number, because the mean of its divisors is an integer number (949579200).

Almost surely, 2^21211021023 is an apocalyptic number.

21211021023 is a deficient number, since it is larger than the sum of its proper divisors (9175513377).

21211021023 is a wasteful number, since it uses less digits than its factorization.

21211021023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10951.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21211021023 its reverse (32012011212), we get a palindrome (53223032235).

The spelling of 21211021023 in words is "twenty-one billion, two hundred eleven million, twenty-one thousand, twenty-three".