21021534022300 has 144 divisors (see below), whose sum is σ = 54463146135552. Its totient is φ = 6886025625600.

The previous prime is 21021534022267. The next prime is 21021534022337. The reversal of 21021534022300 is 322043512012.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13137820 + ... + 14650780.

It is an arithmetic number, because the mean of its divisors is an integer number (378216292608).

Almost surely, 2^{21021534022300} is an apocalyptic number.

21021534022300 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 21021534022300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27231573067776).

21021534022300 is an abundant number, since it is smaller than the sum of its proper divisors (33441612113252).

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

21021534022300 is a wasteful number, since it uses less digits than its factorization.

21021534022300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1513868 (or 1513861 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 21021534022300 its reverse (322043512012), we get a palindrome (21343577534312).

The spelling of 21021534022300 in words is "twenty-one trillion, twenty-one billion, five hundred thirty-four million, twenty-two thousand, three hundred".