1011220001 has 12 divisors (see below), whose sum is σ = 1153204080. Its totient is φ = 879316680.

The previous prime is 1011219991. The next prime is 1011220013. The reversal of 1011220001 is 1000221101.

It is not a de Polignac number, because 1011220001 - 2²² = 1007025697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1011220081) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 81071 + ... + 92708.

It is an arithmetic number, because the mean of its divisors is an integer number (96100340).

Almost surely, 2^1011220001 is an apocalyptic number.

1011220001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1011220001 is a deficient number, since it is larger than the sum of its proper divisors (141984079).

1011220001 is a wasteful number, since it uses less digits than its factorization.

1011220001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173836 (or 173813 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 1011220001 is about 31799.6855487598. The cubic root of 1011220001 is about 1003.7260992734.

Adding to 1011220001 its reverse (1000221101), we get a palindrome (2011441102).

The spelling of 1011220001 in words is "one billion, eleven million, two hundred twenty thousand, one".