21001200332031 has 24 divisors (see below), whose sum is σ = 30496092438240. Its totient is φ = 13926645835200.

The previous prime is 21001200331957. The next prime is 21001200332039. The reversal of 21001200332031 is 13023300210012.

21001200332031 is a `hidden beast` number, since 2 + 100 + 1 + 200 + 332 + 0 + 31 = 666.

It is not a de Polignac number, because 21001200332031 - 2¹⁹ = 21001199807743 is a prime.

It is a super-2 number, since 2×21001200332031² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21001200331995 and 21001200332013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001200332039) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5346040 + ... + 8401341.

It is an arithmetic number, because the mean of its divisors is an integer number (1270670518260).

Almost surely, 2^{21001200332031} is an apocalyptic number.

21001200332031 is a deficient number, since it is larger than the sum of its proper divisors (9494892106209).

21001200332031 is a wasteful number, since it uses less digits than its factorization.

21001200332031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13748287 (or 13748284 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21001200332031 its reverse (13023300210012), we get a palindrome (34024500542043).

The spelling of 21001200332031 in words is "twenty-one trillion, one billion, two hundred million, three hundred thirty-two thousand, thirty-one".