1022020021 has 16 divisors (see below), whose sum is σ = 1124208000. Its totient is φ = 921412800.

The previous prime is 1022020009. The next prime is 1022020037. The reversal of 1022020021 is 1200202201.

It is not a de Polignac number, because 1022020021 - 2⁵ = 1022019989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1022020721) 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, 921015 + ... + 922123.

It is an arithmetic number, because the mean of its divisors is an integer number (70263000).

Almost surely, 2^1022020021 is an apocalyptic number.

1022020021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1022020021 is a deficient number, since it is larger than the sum of its proper divisors (102187979).

1022020021 is a wasteful number, since it uses less digits than its factorization.

1022020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1740.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 1022020021 is about 31969.0478588275. The cubic root of 1022020021 is about 1007.2867808556.

Adding to 1022020021 its reverse (1200202201), we get a palindrome (2222222222).

The spelling of 1022020021 in words is "one billion, twenty-two million, twenty thousand, twenty-one".