1021012220020 has 48 divisors (see below), whose sum is σ = 2322405666000. Its totient is φ = 374809982976.

The previous prime is 1021012220017. The next prime is 1021012220027. The reversal of 1021012220020 is 200222101201.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 26528591376 + 994483628644 = 162876^2 + 997238^2 .

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021012220027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11304645 + ... + 11394604.

It is an arithmetic number, because the mean of its divisors is an integer number (48383451375).

Almost surely, 2^{1021012220020} is an apocalyptic number.

1021012220020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021012220020 is an abundant number, since it is smaller than the sum of its proper divisors (1301393445980).

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

1021012220020 is a wasteful number, since it uses less digits than its factorization.

1021012220020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22699444 (or 22699442 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 1021012220020 its reverse (200222101201), we get a palindrome (1221234321221).

The spelling of 1021012220020 in words is "one trillion, twenty-one billion, twelve million, two hundred twenty thousand, twenty".