21000013320000 has 560 divisors, whose sum is σ = 81569287622592. Its totient is φ = 4699299840000.

The previous prime is 21000013319981. The next prime is 21000013320007. The reversal of 21000013320000 is 2331000012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000013320007) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 16548112 + ... + 17771888.

Almost surely, 2^{21000013320000} is an apocalyptic number.

21000013320000 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 21000013320000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40784643811296).

21000013320000 is an abundant number, since it is smaller than the sum of its proper divisors (60569274302592).

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

21000013320000 is a wasteful number, since it uses less digits than its factorization.

21000013320000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1223836 (or 1223811 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 12.

Adding to 21000013320000 its reverse (2331000012), we get a palindrome (21002344320012).

The spelling of 21000013320000 in words is "twenty-one trillion, thirteen million, three hundred twenty thousand".