1021210011 has 20 divisors (see below), whose sum is σ = 1544831200. Its totient is φ = 672184656.

The previous prime is 1021210007. The next prime is 1021210013. The reversal of 1021210011 is 1100121201.

It is a happy number.

It is not a de Polignac number, because 1021210011 - 2² = 1021210007 is a prime.

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

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021209975 and 1021210002.

It is not an unprimeable number, because it can be changed into a prime (1021210013) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 73396 + ... + 86193.

It is an arithmetic number, because the mean of its divisors is an integer number (77241560).

Almost surely, 2^1021210011 is an apocalyptic number.

1021210011 is a deficient number, since it is larger than the sum of its proper divisors (523621189).

1021210011 is an equidigital number, since it uses as much as digits as its factorization.

1021210011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159680 (or 159671 counting only the distinct ones).

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

The square root of 1021210011 is about 31956.3766876034. The cubic root of 1021210011 is about 1007.0205995036.

Adding to 1021210011 its reverse (1100121201), we get a palindrome (2121331212).

The spelling of 1021210011 in words is "one billion, twenty-one million, two hundred ten thousand, eleven".