1221212007 has 6 divisors (see below), whose sum is σ = 1763972912. Its totient is φ = 814141332.

The previous prime is 1221211991. The next prime is 1221212029. The reversal of 1221212007 is 7002121221.

It is a happy number.

1221212007 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1221212007 - 2⁴ = 1221211991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221212407) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67845103 + ... + 67845120.

Almost surely, 2^1221212007 is an apocalyptic number.

1221212007 is a deficient number, since it is larger than the sum of its proper divisors (542760905).

1221212007 is a wasteful number, since it uses less digits than its factorization.

1221212007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135690229 (or 135690226 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 1221212007 is about 34945.8439159795. The cubic root of 1221212007 is about 1068.8834560748.

Adding to 1221212007 its reverse (7002121221), we get a palindrome (8223333228).

The spelling of 1221212007 in words is "one billion, two hundred twenty-one million, two hundred twelve thousand, seven".