20010001221000 has 384 divisors, whose sum is σ = 81363979756800. Its totient is φ = 4332992486400.

The previous prime is 20010001220971. The next prime is 20010001221043. The reversal of 20010001221000 is 12210001002.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 7161397 + ... + 9555396.

It is an arithmetic number, because the mean of its divisors is an integer number (211885363950).

Almost surely, 2^{20010001221000} is an apocalyptic number.

20010001221000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20010001221000 is an abundant number, since it is smaller than the sum of its proper divisors (61353978535800).

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

20010001221000 is a wasteful number, since it uses less digits than its factorization.

20010001221000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16716846 (or 16716829 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 20010001221000 its reverse (12210001002), we get a palindrome (20022211222002).

The spelling of 20010001221000 in words is "twenty trillion, ten billion, one million, two hundred twenty-one thousand".