10021321020 has 48 divisors (see below), whose sum is σ = 28964855808. Its totient is φ = 2586146880.

The previous prime is 10021321001. The next prime is 10021321039. The reversal of 10021321020 is 2012312001.

It is an interprime number because it is at equal distance from previous prime (10021321001) and next prime (10021321039).

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 = 10021320987 and 10021321005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2692044 + ... + 2695763.

It is an arithmetic number, because the mean of its divisors is an integer number (603434496).

Almost surely, 2^10021321020 is an apocalyptic number.

10021321020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

10021321020 is an abundant number, since it is smaller than the sum of its proper divisors (18943534788).

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

10021321020 is a wasteful number, since it uses less digits than its factorization.

10021321020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5387850 (or 5387848 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 10021321020 its reverse (2012312001), we get a palindrome (12033633021).

The spelling of 10021321020 in words is "ten billion, twenty-one million, three hundred twenty-one thousand, twenty".