21213143035020 has 384 divisors, whose sum is σ = 69344493926400. Its totient is φ = 5373404365824.

The previous prime is 21213143035009. The next prime is 21213143035153. The reversal of 21213143035020 is 2053034131212.

21213143035020 is a `hidden beast` number, since 2 + 1 + 2 + 13 + 143 + 0 + 3 + 502 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1129130067 + ... + 1129148853.

It is an arithmetic number, because the mean of its divisors is an integer number (180584619600).

Almost surely, 2^{21213143035020} is an apocalyptic number.

21213143035020 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 21213143035020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34672246963200).

21213143035020 is an abundant number, since it is smaller than the sum of its proper divisors (48131350891380).

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

21213143035020 is a wasteful number, since it uses less digits than its factorization.

21213143035020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19454 (or 19446 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

Adding to 21213143035020 its reverse (2053034131212), we get a palindrome (23266177166232).

The spelling of 21213143035020 in words is "twenty-one trillion, two hundred thirteen billion, one hundred forty-three million, thirty-five thousand, twenty".