1211020115 has 16 divisors (see below), whose sum is σ = 1514142720. Its totient is φ = 928788960.

The previous prime is 1211020103. The next prime is 1211020117. The reversal of 1211020115 is 5110201121.

It is not a de Polignac number, because 1211020115 - 2¹² = 1211016019 is a prime.

It is a super-2 number, since 2×1211020115² = 2933139437869226450, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1211020115.

It is not an unprimeable number, because it can be changed into a prime (1211020117) 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, 19925 + ... + 53094.

It is an arithmetic number, because the mean of its divisors is an integer number (94633920).

Almost surely, 2^1211020115 is an apocalyptic number.

1211020115 is a deficient number, since it is larger than the sum of its proper divisors (303122605).

1211020115 is a wasteful number, since it uses less digits than its factorization.

1211020115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73162.

The product of its (nonzero) digits is 20, while the sum is 14.

The square root of 1211020115 is about 34799.7142948042. The cubic root of 1211020115 is about 1065.9016118316.

Adding to 1211020115 its reverse (5110201121), we get a palindrome (6321221236).

The spelling of 1211020115 in words is "one billion, two hundred eleven million, twenty thousand, one hundred fifteen".