21201402103020 has 144 divisors (see below), whose sum is σ = 67926751532640. Its totient is φ = 5337863083008.

The previous prime is 21201402103019. The next prime is 21201402103033. The reversal of 21201402103020 is 2030120410212.

It is a happy number.

21201402103020 is a `hidden beast` number, since 2 + 1 + 201 + 402 + 10 + 30 + 20 = 666.

It is a super-2 number, since 2×21201402103020² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21201402102984 and 21201402103002.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9576849 + ... + 11580968.

It is an arithmetic number, because the mean of its divisors is an integer number (471713552310).

Almost surely, 2^{21201402103020} is an apocalyptic number.

21201402103020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21201402103020 is an abundant number, since it is smaller than the sum of its proper divisors (46725349429620).

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

21201402103020 is a wasteful number, since it uses less digits than its factorization.

21201402103020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21158144 (or 21158139 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21201402103020 its reverse (2030120410212), we get a palindrome (23231522513232).

The spelling of 21201402103020 in words is "twenty-one trillion, two hundred one billion, four hundred two million, one hundred three thousand, twenty".