1211022051 has 8 divisors (see below), whose sum is σ = 1622349504. Its totient is φ = 803521320.

The previous prime is 1211022031. The next prime is 1211022053. The reversal of 1211022051 is 1502201121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1211022051 - 2²⁵ = 1177467619 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1211022051.

It is not an unprimeable number, because it can be changed into a prime (1211022053) 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, 955941 + ... + 957206.

It is an arithmetic number, because the mean of its divisors is an integer number (202793688).

Almost surely, 2^1211022051 is an apocalyptic number.

1211022051 is a deficient number, since it is larger than the sum of its proper divisors (411327453).

1211022051 is a wasteful number, since it uses less digits than its factorization.

1211022051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1913361.

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 1211022051 is about 34799.7421111134. The cubic root of 1211022051 is about 1065.9021798333.

Adding to 1211022051 its reverse (1502201121), we get a palindrome (2713223172).

The spelling of 1211022051 in words is "one billion, two hundred eleven million, twenty-two thousand, fifty-one".