21202113020 has 48 divisors (see below), whose sum is σ = 48790038528. Its totient is φ = 7675268160.

The previous prime is 21202113001. The next prime is 21202113029. The reversal of 21202113020 is 2031120212.

It is a happy number.

It is a super-3 number, since 3×21202113020³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21202112986 and 21202113004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21202113029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 167024 + ... + 265143.

It is an arithmetic number, because the mean of its divisors is an integer number (1016459136).

Almost surely, 2^21202113020 is an apocalyptic number.

21202113020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21202113020 is an abundant number, since it is smaller than the sum of its proper divisors (27587925508).

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

21202113020 is a wasteful number, since it uses less digits than its factorization.

21202113020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432410 (or 432408 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21202113020 its reverse (2031120212), we get a palindrome (23233233232).

The spelling of 21202113020 in words is "twenty-one billion, two hundred two million, one hundred thirteen thousand, twenty".