1021021011 has 8 divisors (see below), whose sum is σ = 1512623760. Its totient is φ = 680680656.

The previous prime is 1021021007. The next prime is 1021021013. The reversal of 1021021011 is 1101201201.

It is a happy number.

It is not a de Polignac number, because 1021021011 - 2² = 1021021007 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 = 1021020984 and 1021021002.

It is not an unprimeable number, because it can be changed into a prime (1021021013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18907770 + ... + 18907823.

It is an arithmetic number, because the mean of its divisors is an integer number (189077970).

Almost surely, 2^1021021011 is an apocalyptic number.

1021021011 is a deficient number, since it is larger than the sum of its proper divisors (491602749).

1021021011 is an equidigital number, since it uses as much as digits as its factorization.

1021021011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37815602 (or 37815596 counting only the distinct ones).

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

The square root of 1021021011 is about 31953.4193944873. The cubic root of 1021021011 is about 1006.9584710370.

Adding to 1021021011 its reverse (1101201201), we get a palindrome (2122222212).

The spelling of 1021021011 in words is "one billion, twenty-one million, twenty-one thousand, eleven".