20012000221000 has 64 divisors (see below), whose sum is σ = 46831822717680. Its totient is φ = 8004160396800.

The previous prime is 20012000220977. The next prime is 20012000221007. The reversal of 20012000221000 is 12200021002.

It can be written as a sum of positive squares in 8 ways, for example, as 1892181820356 + 18119818400644 = 1375566^2 + 4256738^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (20012000221007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11819692 + ... + 13406308.

Almost surely, 2^{20012000221000} is an apocalyptic number.

20012000221000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20012000221000 is an abundant number, since it is smaller than the sum of its proper divisors (26819822496680).

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

20012000221000 is a wasteful number, since it uses less digits than its factorization.

20012000221000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1599251 (or 1599237 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 20012000221000 its reverse (12200021002), we get a palindrome (20024200242002).

It can be divided in two parts, 200120002 and 21000, that added together give a palindrome (200141002).

The spelling of 20012000221000 in words is "twenty trillion, twelve billion, two hundred twenty-one thousand".