21201010120 has 64 divisors (see below), whose sum is σ = 48281310000. Its totient is φ = 8377924608.

The previous prime is 21201010093. The next prime is 21201010183. The reversal of 21201010120 is 2101010212.

It can be written as a sum of positive squares in 8 ways, for example, as 19735192324 + 1465817796 = 140482^2 + 38286^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 21201010097 and 21201010106.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1514674 + ... + 1528606.

Almost surely, 2^21201010120 is an apocalyptic number.

21201010120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21201010120 is an abundant number, since it is smaller than the sum of its proper divisors (27080299880).

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

21201010120 is a wasteful number, since it uses less digits than its factorization.

21201010120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14402 (or 14398 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21201010120 its reverse (2101010212), we get a palindrome (23302020332).

The spelling of 21201010120 in words is "twenty-one billion, two hundred one million, ten thousand, one hundred twenty".