21206431150 has 12 divisors (see below), whose sum is σ = 39443962032. Its totient is φ = 8482572440.

The previous prime is 21206431133. The next prime is 21206431151. The reversal of 21206431150 is 5113460212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21206431151) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 212064262 + ... + 212064361.

It is an arithmetic number, because the mean of its divisors is an integer number (3286996836).

Almost surely, 2^21206431150 is an apocalyptic number.

21206431150 is a deficient number, since it is larger than the sum of its proper divisors (18237530882).

21206431150 is a wasteful number, since it uses less digits than its factorization.

21206431150 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424128635 (or 424128630 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

Adding to 21206431150 its reverse (5113460212), we get a palindrome (26319891362).

The spelling of 21206431150 in words is "twenty-one billion, two hundred six million, four hundred thirty-one thousand, one hundred fifty".