21212150431 has 8 divisors (see below), whose sum is σ = 22142592704. Its totient is φ = 20300505120.

The previous prime is 21212150429. The next prime is 21212150459. The reversal of 21212150431 is 13405121212.

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 21212150431 - 2¹ = 21212150429 is a prime.

It is a super-2 number, since 2×21212150431² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212150831) 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, 4696935 + ... + 4701448.

It is an arithmetic number, because the mean of its divisors is an integer number (2767824088).

Almost surely, 2^21212150431 is an apocalyptic number.

21212150431 is a deficient number, since it is larger than the sum of its proper divisors (930442273).

21212150431 is an equidigital number, since it uses as much as digits as its factorization.

21212150431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9398481.

The product of its (nonzero) digits is 480, while the sum is 22.

Adding to 21212150431 its reverse (13405121212), we get a palindrome (34617271643).

The spelling of 21212150431 in words is "twenty-one billion, two hundred twelve million, one hundred fifty thousand, four hundred thirty-one".