1021020120105 has 48 divisors (see below), whose sum is σ = 1808203824000. Its totient is φ = 490228862464.

The previous prime is 1021020120101. The next prime is 1021020120143. The reversal of 1021020120105 is 5010210201201.

1021020120105 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1021020120105 - 2² = 1021020120101 is a prime.

It is a super-2 number, since 2×1021020120105² (a number of 25 digits) contains 22 as substring.

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 (1021020120101) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3649605 + ... + 3919394.

It is an arithmetic number, because the mean of its divisors is an integer number (37670913000).

Almost surely, 2^{1021020120105} is an apocalyptic number.

1021020120105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1021020120105 is a deficient number, since it is larger than the sum of its proper divisors (787183703895).

1021020120105 is a wasteful number, since it uses less digits than its factorization.

1021020120105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7569070 (or 7569047 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 15.

Adding to 1021020120105 its reverse (5010210201201), we get a palindrome (6031230321306).

The spelling of 1021020120105 in words is "one trillion, twenty-one billion, twenty million, one hundred twenty thousand, one hundred five".