21213433000 has 128 divisors (see below), whose sum is σ = 52870540320. Its totient is φ = 7938969600.

The previous prime is 21213432973. The next prime is 21213433019. The reversal of 21213433000 is 33431212.

It can be written as a sum of positive squares in 16 ways, for example, as 2550048004 + 18663384996 = 50498^2 + 136614^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2937394 + ... + 2944606.

Almost surely, 2^21213433000 is an apocalyptic number.

21213433000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21213433000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26435270160).

21213433000 is an abundant number, since it is smaller than the sum of its proper divisors (31657107320).

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

21213433000 is a wasteful number, since it uses less digits than its factorization.

21213433000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7424 (or 7410 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21213433000 its reverse (33431212), we get a palindrome (21246864212).

The spelling of 21213433000 in words is "twenty-one billion, two hundred thirteen million, four hundred thirty-three thousand".