1020000021111 has 24 divisors (see below), whose sum is σ = 1477901362080. Its totient is φ = 677893237056.

The previous prime is 1020000021017. The next prime is 1020000021121. The reversal of 1020000021111 is 1111200000201.

It is a happy number.

It is not a de Polignac number, because 1020000021111 - 2¹⁹ = 1019999496823 is a prime.

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 = 1020000021093 and 1020000021102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020000021121) 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, 8118670 + ... + 8243348.

It is an arithmetic number, because the mean of its divisors is an integer number (61579223420).

Almost surely, 2^{1020000021111} is an apocalyptic number.

1020000021111 is a deficient number, since it is larger than the sum of its proper divisors (457901340969).

1020000021111 is a wasteful number, since it uses less digits than its factorization.

1020000021111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127495 (or 127492 counting only the distinct ones).

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

Adding to 1020000021111 its reverse (1111200000201), we get a palindrome (2131200021312).

The spelling of 1020000021111 in words is "one trillion, twenty billion, twenty-one thousand, one hundred eleven".