1021211151 has 4 divisors (see below), whose sum is σ = 1361614872. Its totient is φ = 680807432.

The previous prime is 1021211129. The next prime is 1021211153. The reversal of 1021211151 is 1511121201.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1021211151 - 2¹⁵ = 1021178383 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1021211151.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021211153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170201856 + ... + 170201861.

It is an arithmetic number, because the mean of its divisors is an integer number (340403718).

Almost surely, 2^1021211151 is an apocalyptic number.

1021211151 is a deficient number, since it is larger than the sum of its proper divisors (340403721).

1021211151 is an equidigital number, since it uses as much as digits as its factorization.

1021211151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340403720.

The product of its (nonzero) digits is 20, while the sum is 15.

The square root of 1021211151 is about 31956.3945244140. The cubic root of 1021211151 is about 1007.0209742235.

Adding to 1021211151 its reverse (1511121201), we get a palindrome (2532332352).

The spelling of 1021211151 in words is "one billion, twenty-one million, two hundred eleven thousand, one hundred fifty-one".