1201122021 has 16 divisors (see below), whose sum is σ = 1748036160. Its totient is φ = 727557120.

The previous prime is 1201121963. The next prime is 1201122023. The reversal of 1201122021 is 1202211021.

It is a de Polignac number, because none of the positive numbers 2^k-1201122021 is a prime.

It is a super-2 number, since 2×1201122021² = 2885388218662248882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1201121988 and 1201122006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201122023) 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, 58885 + ... + 76613.

It is an arithmetic number, because the mean of its divisors is an integer number (109252260).

Almost surely, 2^1201122021 is an apocalyptic number.

1201122021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1201122021 is a deficient number, since it is larger than the sum of its proper divisors (546914139).

1201122021 is a wasteful number, since it uses less digits than its factorization.

1201122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19796.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1201122021 is about 34657.2073456590. The cubic root of 1201122021 is about 1062.9896674627.

Adding to 1201122021 its reverse (1202211021), we get a palindrome (2403333042).

The spelling of 1201122021 in words is "one billion, two hundred one million, one hundred twenty-two thousand, twenty-one".