100021211020 has 48 divisors (see below), whose sum is σ = 212437699488. Its totient is φ = 39553817600.

The previous prime is 100021210979. The next prime is 100021211023. The reversal of 100021211020 is 20112120001.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 100021210988 and 100021211006.

It is not an unprimeable number, because it can be changed into a prime (100021211023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1343412 + ... + 1415908.

It is an arithmetic number, because the mean of its divisors is an integer number (4425785406).

Almost surely, 2^100021211020 is an apocalyptic number.

100021211020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

100021211020 is an abundant number, since it is smaller than the sum of its proper divisors (112416488468).

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

100021211020 is a wasteful number, since it uses less digits than its factorization.

100021211020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73290 (or 73288 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 100021211020 its reverse (20112120001), we get a palindrome (120133331021).

The spelling of 100021211020 in words is "one hundred billion, twenty-one million, two hundred eleven thousand, twenty".