1010220021 has 24 divisors (see below), whose sum is σ = 1511288064. Its totient is φ = 649847520.

The previous prime is 1010219999. The next prime is 1010220023. The reversal of 1010220021 is 1200220101.

It is not a de Polignac number, because 1010220021 - 2¹⁵ = 1010187253 is a prime.

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 = 1010219985 and 1010220012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1010220023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13215 + ... + 46851.

It is an arithmetic number, because the mean of its divisors is an integer number (62970336).

Almost surely, 2^1010220021 is an apocalyptic number.

It is an amenable number.

1010220021 is a deficient number, since it is larger than the sum of its proper divisors (501068043).

1010220021 is a wasteful number, since it uses less digits than its factorization.

1010220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33761 (or 33758 counting only the distinct ones).

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

The square root of 1010220021 is about 31783.9585482992. The cubic root of 1010220021 is about 1003.3951336887.

Adding to 1010220021 its reverse (1200220101), we get a palindrome (2210440122).

The spelling of 1010220021 in words is "one billion, ten million, two hundred twenty thousand, twenty-one".