1211022001 has 8 divisors (see below), whose sum is σ = 1385302464. Its totient is φ = 1037060880.

The previous prime is 1211021993. The next prime is 1211022031. The reversal of 1211022001 is 1002201121.

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

It is a cyclic number.

It is not a de Polignac number, because 1211022001 - 2³ = 1211021993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211022031) 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, 71650 + ... + 86923.

It is an arithmetic number, because the mean of its divisors is an integer number (173162808).

Almost surely, 2^1211022001 is an apocalyptic number.

It is an amenable number.

1211022001 is a deficient number, since it is larger than the sum of its proper divisors (174280463).

1211022001 is a wasteful number, since it uses less digits than its factorization.

1211022001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159671.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 1211022001 is about 34799.7413927173. The cubic root of 1211022001 is about 1065.9021651638.

Adding to 1211022001 its reverse (1002201121), we get a palindrome (2213223122).

The spelling of 1211022001 in words is "one billion, two hundred eleven million, twenty-two thousand, one".