1021101001020 has 72 divisors (see below), whose sum is σ = 3099253706640. Its totient is φ = 272125336320.

The previous prime is 1021101001003. The next prime is 1021101001027. The reversal of 1021101001020 is 201001011201.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 1021101000993 and 1021101001011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021101001027) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1460521 + ... + 2043360.

It is an arithmetic number, because the mean of its divisors is an integer number (43045190370).

Almost surely, 2^{1021101001020} is an apocalyptic number.

1021101001020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021101001020 is an abundant number, since it is smaller than the sum of its proper divisors (2078152705620).

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

1021101001020 is a wasteful number, since it uses less digits than its factorization.

1021101001020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3505515 (or 3505510 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 1021101001020 its reverse (201001011201), we get a palindrome (1222102012221).

The spelling of 1021101001020 in words is "one trillion, twenty-one billion, one hundred one million, one thousand, twenty".