21202001101020 has 24 divisors (see below), whose sum is σ = 59365603083024. Its totient is φ = 5653866960256.

The previous prime is 21202001101003. The next prime is 21202001101027. The reversal of 21202001101020 is 2010110020212.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 21202001100987 and 21202001101005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202001101027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 176683342449 + ... + 176683342568.

It is an arithmetic number, because the mean of its divisors is an integer number (2473566795126).

Almost surely, 2^{21202001101020} is an apocalyptic number.

21202001101020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21202001101020 is an abundant number, since it is smaller than the sum of its proper divisors (38163601982004).

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

21202001101020 is a wasteful number, since it uses less digits than its factorization.

21202001101020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353366685029 (or 353366685027 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21202001101020 its reverse (2010110020212), we get a palindrome (23212111121232).

The spelling of 21202001101020 in words is "twenty-one trillion, two hundred two billion, one million, one hundred one thousand, twenty".