21200030031 has 8 divisors (see below), whose sum is σ = 28322904960. Its totient is φ = 14105254232.

The previous prime is 21200030011. The next prime is 21200030039. The reversal of 21200030031 is 13003000212.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21200030031 - 2¹⁷ = 21199898959 is a prime.

It is a super-2 number, since 2×21200030031² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21200029989 and 21200030016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200030039) 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, 7023021 + ... + 7026038.

It is an arithmetic number, because the mean of its divisors is an integer number (3540363120).

Almost surely, 2^21200030031 is an apocalyptic number.

21200030031 is a deficient number, since it is larger than the sum of its proper divisors (7122874929).

21200030031 is a wasteful number, since it uses less digits than its factorization.

21200030031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14049565.

The product of its (nonzero) digits is 36, while the sum is 12.

Adding to 21200030031 its reverse (13003000212), we get a palindrome (34203030243).

The spelling of 21200030031 in words is "twenty-one billion, two hundred million, thirty thousand, thirty-one".