21221110010120 has 64 divisors (see below), whose sum is σ = 48655673438400. Its totient is φ = 8327576561920.

The previous prime is 21221110010117. The next prime is 21221110010123. The reversal of 21221110010120 is 2101001112212.

It is an interprime number because it is at equal distance from previous prime (21221110010117) and next prime (21221110010123).

It is a junction number, because it is equal to n+sod(n) for n = 21221110010095 and 21221110010104.

It is not an unprimeable number, because it can be changed into a prime (21221110010123) 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, 7998059 + ... + 10315578.

It is an arithmetic number, because the mean of its divisors is an integer number (760244897475).

Almost surely, 2^{21221110010120} is an apocalyptic number.

21221110010120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21221110010120 is an abundant number, since it is smaller than the sum of its proper divisors (27434563428280).

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

21221110010120 is a wasteful number, since it uses less digits than its factorization.

21221110010120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18314198 (or 18314194 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21221110010120 its reverse (2101001112212), we get a palindrome (23322111122332).

The spelling of 21221110010120 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred ten million, ten thousand, one hundred twenty".