21220001210120 has 32 divisors (see below), whose sum is σ = 47745160245720. Its totient is φ = 8487972480000.

The previous prime is 21220001210101. The next prime is 21220001210143. The reversal of 21220001210120 is 2101210002212.

It can be written as a sum of positive squares in 4 ways, for example, as 20052179497156 + 1167821712964 = 4477966^2 + 1080658^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21220001210095 and 21220001210104.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14919914 + ... + 16280166.

Almost surely, 2^{21220001210120} is an apocalyptic number.

21220001210120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21220001210120 is an abundant number, since it is smaller than the sum of its proper divisors (26525159035600).

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

21220001210120 is a wasteful number, since it uses less digits than its factorization.

21220001210120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1750265 (or 1750261 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21220001210120 its reverse (2101210002212), we get a palindrome (23321211212332).

The spelling of 21220001210120 in words is "twenty-one trillion, two hundred twenty billion, one million, two hundred ten thousand, one hundred twenty".