1022021000020 has 48 divisors (see below), whose sum is σ = 2194250042880. Its totient is φ = 399682992384.

The previous prime is 1022021000009. The next prime is 1022021000051. The reversal of 1022021000020 is 200001202201.

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 = 1022020999970 and 1022021000006.

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, 300601 + ... + 1460959.

It is an arithmetic number, because the mean of its divisors is an integer number (45713542560).

Almost surely, 2^{1022021000020} is an apocalyptic number.

1022021000020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1022021000020 is an abundant number, since it is smaller than the sum of its proper divisors (1172229042860).

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

1022021000020 is a wasteful number, since it uses less digits than its factorization.

1022021000020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1161352 (or 1161350 counting only the distinct ones).

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

Adding to 1022021000020 its reverse (200001202201), we get a palindrome (1222022202221).

The spelling of 1022021000020 in words is "one trillion, twenty-two billion, twenty-one million, twenty", and thus it is an aban number and an uban number.