21022211200020 has 96 divisors (see below), whose sum is σ = 60018210282240. Its totient is φ = 5495986129920.

The previous prime is 21022211200019. The next prime is 21022211200021. The reversal of 21022211200020 is 2000211222012.

It is an interprime number because it is at equal distance from previous prime (21022211200019) and next prime (21022211200021).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022211200021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1698601 + ... + 6702959.

It is an arithmetic number, because the mean of its divisors is an integer number (625189690440).

Almost surely, 2^{21022211200020} is an apocalyptic number.

21022211200020 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 21022211200020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30009105141120).

21022211200020 is an abundant number, since it is smaller than the sum of its proper divisors (38995999082220).

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

21022211200020 is a wasteful number, since it uses less digits than its factorization.

21022211200020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5005745 (or 5005743 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21022211200020 its reverse (2000211222012), we get a palindrome (23022422422032).

The spelling of 21022211200020 in words is "twenty-one trillion, twenty-two billion, two hundred eleven million, two hundred thousand, twenty".