21001031132011 has 4 divisors (see below), whose sum is σ = 24001178436592. Its totient is φ = 18000883827432.

The previous prime is 21001031131987. The next prime is 21001031132069. The reversal of 21001031132011 is 11023113010012.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21001031132011 - 2⁹ = 21001031131499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21001031130011) 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, 1500073652280 + ... + 1500073652293.

It is an arithmetic number, because the mean of its divisors is an integer number (6000294609148).

Almost surely, 2^{21001031132011} is an apocalyptic number.

21001031132011 is a deficient number, since it is larger than the sum of its proper divisors (3000147304581).

21001031132011 is an equidigital number, since it uses as much as digits as its factorization.

21001031132011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3000147304580.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 21001031132011 its reverse (11023113010012), we get a palindrome (32024144142023).

The spelling of 21001031132011 in words is "twenty-one trillion, one billion, thirty-one million, one hundred thirty-two thousand, eleven".