1221000011007 has 16 divisors (see below), whose sum is σ = 1860588398592. Its totient is φ = 697707934560.

The previous prime is 1221000010973. The next prime is 1221000011029. The reversal of 1221000011007 is 7001100001221.

It is not a de Polignac number, because 1221000011007 - 2²⁴ = 1220983233791 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221000011107) 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, 3072573 + ... + 3447129.

It is an arithmetic number, because the mean of its divisors is an integer number (116286774912).

Almost surely, 2^{1221000011007} is an apocalyptic number.

1221000011007 is a deficient number, since it is larger than the sum of its proper divisors (639588387585).

1221000011007 is a wasteful number, since it uses less digits than its factorization.

1221000011007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529798.

The product of its (nonzero) digits is 28, while the sum is 15.

Adding to 1221000011007 its reverse (7001100001221), we get a palindrome (8222100012228).

The spelling of 1221000011007 in words is "one trillion, two hundred twenty-one billion, eleven thousand, seven".