21405332150 has 24 divisors (see below), whose sum is σ = 40261273560. Its totient is φ = 8465927360.

The previous prime is 21405332141. The next prime is 21405332159. The reversal of 21405332150 is 5123350412.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21405332141) and next prime (21405332159).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21405332159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2400644 + ... + 2409543.

It is an arithmetic number, because the mean of its divisors is an integer number (1677553065).

Almost surely, 2^21405332150 is an apocalyptic number.

21405332150 is a deficient number, since it is larger than the sum of its proper divisors (18855941410).

21405332150 is a wasteful number, since it uses less digits than its factorization.

21405332150 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4810288 (or 4810283 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

Adding to 21405332150 its reverse (5123350412), we get a palindrome (26528682562).

The spelling of 21405332150 in words is "twenty-one billion, four hundred five million, three hundred thirty-two thousand, one hundred fifty".