21132211021 has 8 divisors (see below), whose sum is σ = 21839207544. Its totient is φ = 20434337280.

The previous prime is 21132210977. The next prime is 21132211073. The reversal of 21132211021 is 12011223112.

It can be written as a sum of positive squares in 4 ways, for example, as 1098922500 + 20033288521 = 33150^2 + 141539^2 .

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 21132211021 - 2¹⁹ = 21131686733 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21132210986 and 21132211004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21132211081) 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, 2275986 + ... + 2285251.

It is an arithmetic number, because the mean of its divisors is an integer number (2729900943).

Almost surely, 2^21132211021 is an apocalyptic number.

It is an amenable number.

21132211021 is a deficient number, since it is larger than the sum of its proper divisors (706996523).

21132211021 is a wasteful number, since it uses less digits than its factorization.

21132211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4561391.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21132211021 its reverse (12011223112), we get a palindrome (33143434133).

The spelling of 21132211021 in words is "twenty-one billion, one hundred thirty-two million, two hundred eleven thousand, twenty-one".