1021220023020 has 48 divisors (see below), whose sum is σ = 3027617012448. Its totient is φ = 256306201600.

The previous prime is 1021220022983. The next prime is 1021220023027. The reversal of 1021220023020 is 203200221201.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (1021220023027) 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, 500597031 + ... + 500599070.

It is an arithmetic number, because the mean of its divisors is an integer number (63075354426).

Almost surely, 2^{1021220023020} is an apocalyptic number.

1021220023020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021220023020 is an abundant number, since it is smaller than the sum of its proper divisors (2006396989428).

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

1021220023020 is a wasteful number, since it uses less digits than its factorization.

1021220023020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1001196130 (or 1001196128 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 1021220023020 its reverse (203200221201), we get a palindrome (1224420244221).

The spelling of 1021220023020 in words is "one trillion, twenty-one billion, two hundred twenty million, twenty-three thousand, twenty".