21001041031011 has 16 divisors (see below), whose sum is σ = 28026989802240. Its totient is φ = 13987898094240.

The previous prime is 21001041030979. The next prime is 21001041031037. The reversal of 21001041031011 is 11013014010012.

It is not a de Polignac number, because 21001041031011 - 2⁵ = 21001041030979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21001041031081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16411410 + ... + 17644728.

It is an arithmetic number, because the mean of its divisors is an integer number (1751686862640).

Almost surely, 2^{21001041031011} is an apocalyptic number.

21001041031011 is a deficient number, since it is larger than the sum of its proper divisors (7025948771229).

21001041031011 is a wasteful number, since it uses less digits than its factorization.

21001041031011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1238506.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 21001041031011 its reverse (11013014010012), we get a palindrome (32014055041023).

The spelling of 21001041031011 in words is "twenty-one trillion, one billion, forty-one million, thirty-one thousand, eleven".