21002022020120 has 32 divisors (see below), whose sum is σ = 48531699536400. Its totient is φ = 8173759920768.

The previous prime is 21002022020047. The next prime is 21002022020131. The reversal of 21002022020120 is 2102022020012.

It is a junction number, because it is equal to n+sod(n) for n = 21002022020095 and 21002022020104.

It is a congruent number.

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, 7095276230 + ... + 7095279189.

Almost surely, 2^{21002022020120} is an apocalyptic number.

21002022020120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21002022020120 is an abundant number, since it is smaller than the sum of its proper divisors (27529677516280).

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

21002022020120 is a wasteful number, since it uses less digits than its factorization.

21002022020120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14190555467 (or 14190555463 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21002022020120 its reverse (2102022020012), we get a palindrome (23104044040132).

The spelling of 21002022020120 in words is "twenty-one trillion, two billion, twenty-two million, twenty thousand, one hundred twenty".