20210021010 has 24 divisors (see below), whose sum is σ = 52546054860. Its totient is φ = 5389338912.

The previous prime is 20210020973. The next prime is 20210021021. The reversal of 20210021010 is 1012001202.

It can be written as a sum of positive squares in 2 ways, for example, as 18868044321 + 1341976689 = 137361^2 + 36633^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 20210020983 and 20210021001.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 112277805 + ... + 112277984.

Almost surely, 2^20210021010 is an apocalyptic number.

20210021010 is an abundant number, since it is smaller than the sum of its proper divisors (32336033850).

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

20210021010 is a wasteful number, since it uses less digits than its factorization.

20210021010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224555802 (or 224555799 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 20210021010 its reverse (1012001202), we get a palindrome (21222022212).

The spelling of 20210021010 in words is "twenty billion, two hundred ten million, twenty-one thousand, ten".