21020002111020 has 192 divisors, whose sum is σ = 68217491865600. Its totient is φ = 4782442602240.

The previous prime is 21020002110959. The next prime is 21020002111033. The reversal of 21020002111020 is 2011120002012.

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 = 21020002110987 and 21020002111005.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6491100 + ... + 9174659.

It is an arithmetic number, because the mean of its divisors is an integer number (355299436800).

Almost surely, 2^{21020002111020} is an apocalyptic number.

21020002111020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21020002111020 is an abundant number, since it is smaller than the sum of its proper divisors (47197489754580).

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

21020002111020 is a wasteful number, since it uses less digits than its factorization.

21020002111020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15665908 (or 15665906 counting only the distinct ones).

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

Adding to 21020002111020 its reverse (2011120002012), we get a palindrome (23031122113032).

The spelling of 21020002111020 in words is "twenty-one trillion, twenty billion, two million, one hundred eleven thousand, twenty".