21200000021031 has 8 divisors (see below), whose sum is σ = 30441025671280. Its totient is φ = 13046153859072.

The previous prime is 21200000021021. The next prime is 21200000021047. The reversal of 21200000021031 is 13012000000212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21200000021031 - 2¹¹ = 21200000018983 is a prime.

It is a super-2 number, since 2×21200000021031² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21200000020998 and 21200000021016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200000021021) 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, 271794872026 + ... + 271794872103.

It is an arithmetic number, because the mean of its divisors is an integer number (3805128208910).

Almost surely, 2^{21200000021031} is an apocalyptic number.

21200000021031 is a deficient number, since it is larger than the sum of its proper divisors (9241025650249).

21200000021031 is a wasteful number, since it uses less digits than its factorization.

21200000021031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543589744145.

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 21200000021031 its reverse (13012000000212), we get a palindrome (34212000021243).

The spelling of 21200000021031 in words is "twenty-one trillion, two hundred billion, twenty-one thousand, thirty-one".