20100021211020 has 96 divisors (see below), whose sum is σ = 56716384386816. Its totient is φ = 5318460576000.

The previous prime is 20100021211003. The next prime is 20100021211051. The reversal of 20100021211020 is 2011212000102.

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 = 20100021210987 and 20100021211005.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 68290170 + ... + 68583870.

It is an arithmetic number, because the mean of its divisors is an integer number (590795670696).

Almost surely, 2^{20100021211020} is an apocalyptic number.

20100021211020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20100021211020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28358192193408).

20100021211020 is an abundant number, since it is smaller than the sum of its proper divisors (36616363175796).

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

20100021211020 is a wasteful number, since it uses less digits than its factorization.

20100021211020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302551 (or 302549 counting only the distinct ones).

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

Adding to 20100021211020 its reverse (2011212000102), we get a palindrome (22111233211122).

The spelling of 20100021211020 in words is "twenty trillion, one hundred billion, twenty-one million, two hundred eleven thousand, twenty".