1020010021220 has 12 divisors (see below), whose sum is σ = 2142021044604. Its totient is φ = 408004008480.

The previous prime is 1020010021157. The next prime is 1020010021231. The reversal of 1020010021220 is 221200100201.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 777229139236 + 242780881984 = 881606^2 + 492728^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25500250511 + ... + 25500250550.

It is an arithmetic number, because the mean of its divisors is an integer number (178501753717).

Almost surely, 2^{1020010021220} is an apocalyptic number.

1020010021220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1020010021220 is an abundant number, since it is smaller than the sum of its proper divisors (1122011023384).

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

1020010021220 is a wasteful number, since it uses less digits than its factorization.

1020010021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51000501070 (or 51000501068 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 1020010021220 its reverse (221200100201), we get a palindrome (1241210121421).

The spelling of 1020010021220 in words is "one trillion, twenty billion, ten million, twenty-one thousand, two hundred twenty".