1213021016 has 16 divisors (see below), whose sum is σ = 2291018040. Its totient is φ = 602082880.

The previous prime is 1213020967. The next prime is 1213021031. The reversal of 1213021016 is 6101203121.

It is a junction number, because it is equal to n+sod(n) for n = 1213020985 and 1213021003.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 552290 + ... + 554481.

Almost surely, 2^1213021016 is an apocalyptic number.

It is an amenable number.

1213021016 is a deficient number, since it is larger than the sum of its proper divisors (1077997024).

1213021016 is a wasteful number, since it uses less digits than its factorization.

1213021016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1106914 (or 1106910 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 1213021016 is about 34828.4512432006. The cubic root of 1213021016 is about 1066.4883320785.

Adding to 1213021016 its reverse (6101203121), we get a palindrome (7314224137).

The spelling of 1213021016 in words is "one billion, two hundred thirteen million, twenty-one thousand, sixteen".