21021132201121 has 4 divisors (see below), whose sum is σ = 22638142370452. Its totient is φ = 19404122031792.

The previous prime is 21021132201103. The next prime is 21021132201137. The reversal of 21021132201121 is 12110223112012.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2237238147600 + 18783894053521 = 1495740^2 + 4334039^2 .

It is a cyclic number.

It is not a de Polignac number, because 21021132201121 - 2⁵ = 21021132201089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21021132201101) 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, 808505084646 + ... + 808505084671.

It is an arithmetic number, because the mean of its divisors is an integer number (5659535592613).

Almost surely, 2^{21021132201121} is an apocalyptic number.

It is an amenable number.

21021132201121 is a deficient number, since it is larger than the sum of its proper divisors (1617010169331).

21021132201121 is a wasteful number, since it uses less digits than its factorization.

21021132201121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1617010169330.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 21021132201121 its reverse (12110223112012), we get a palindrome (33131355313133).

The spelling of 21021132201121 in words is "twenty-one trillion, twenty-one billion, one hundred thirty-two million, two hundred one thousand, one hundred twenty-one".