21320221122100 has 72 divisors (see below), whose sum is σ = 46505523817088. Its totient is φ = 8483827766400.

The previous prime is 21320221122037. The next prime is 21320221122107. The reversal of 21320221122100 is 122112202312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21320221122107) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16868809 + ... + 18088591.

Almost surely, 2^{21320221122100} is an apocalyptic number.

21320221122100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21320221122100 is an abundant number, since it is smaller than the sum of its proper divisors (25185302694988).

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

21320221122100 is a wasteful number, since it uses less digits than its factorization.

21320221122100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1220705 (or 1220698 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21320221122100 its reverse (122112202312), we get a palindrome (21442333324412).

The spelling of 21320221122100 in words is "twenty-one trillion, three hundred twenty billion, two hundred twenty-one million, one hundred twenty-two thousand, one hundred".