21533150400 has 84 divisors (see below), whose sum is σ = 70646693352. Its totient is φ = 5742172160.

The previous prime is 21533150381. The next prime is 21533150407. The reversal of 21533150400 is 405133512.

It is a super-2 number, since 2×21533150400² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (21533150407) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2238237 + ... + 2247836.

Almost surely, 2^21533150400 is an apocalyptic number.

21533150400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21533150400 is an abundant number, since it is smaller than the sum of its proper divisors (49113542952).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21533150400 is a wasteful number, since it uses less digits than its factorization.

21533150400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4486098 (or 4486083 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

Adding to 21533150400 its reverse (405133512), we get a palindrome (21938283912).

The spelling of 21533150400 in words is "twenty-one billion, five hundred thirty-three million, one hundred fifty thousand, four hundred".