1021000101 has 16 divisors (see below), whose sum is σ = 1487566848. Its totient is φ = 617756400.

The previous prime is 1021000073. The next prime is 1021000103. The reversal of 1021000101 is 1010001201.

It is a de Polignac number, because none of the positive numbers 2^k-1021000101 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1021000101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021000103) 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, 5455 + ... + 45516.

It is an arithmetic number, because the mean of its divisors is an integer number (92972928).

Almost surely, 2^1021000101 is an apocalyptic number.

1021000101 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1021000101 is a deficient number, since it is larger than the sum of its proper divisors (466566747).

1021000101 is a wasteful number, since it uses less digits than its factorization.

1021000101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51592.

The product of its (nonzero) digits is 2, while the sum is 6.

The square root of 1021000101 is about 31953.0921977827. The cubic root of 1021000101 is about 1006.9515969880.

Adding to 1021000101 its reverse (1010001201), we get a palindrome (2031001302).

The spelling of 1021000101 in words is "one billion, twenty-one million, one hundred one", and thus it is an aban number.