21201001021120 has 56 divisors (see below), whose sum is σ = 50502276484704. Its totient is φ = 8477478782976.

The previous prime is 21201001021117. The next prime is 21201001021153. The reversal of 21201001021120 is 2112010010212.

It is a self number, because there is not a number n which added to its sum of digits gives 21201001021120.

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, 10482189 + ... + 12340108.

Almost surely, 2^{21201001021120} is an apocalyptic number.

21201001021120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21201001021120 is an abundant number, since it is smaller than the sum of its proper divisors (29301275463584).

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

21201001021120 is a wasteful number, since it uses less digits than its factorization.

21201001021120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22825217 (or 22825207 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21201001021120 its reverse (2112010010212), we get a palindrome (23313011031332).

The spelling of 21201001021120 in words is "twenty-one trillion, two hundred one billion, one million, twenty-one thousand, one hundred twenty".