1213021012 has 24 divisors (see below), whose sum is σ = 2531523456. Its totient is φ = 497263008.

The previous prime is 1213020967. The next prime is 1213021031. The reversal of 1213021012 is 2101203121.

It is a junction number, because it is equal to n+sod(n) for n = 1213020983 and 1213021001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 941143 + ... + 942430.

It is an arithmetic number, because the mean of its divisors is an integer number (105480144).

Almost surely, 2^1213021012 is an apocalyptic number.

It is an amenable number.

1213021012 is an abundant number, since it is smaller than the sum of its proper divisors (1318502444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1213021012 is a wasteful number, since it uses less digits than its factorization.

1213021012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1883607 (or 1883605 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1213021012 is about 34828.4511857763. The cubic root of 1213021012 is about 1066.4883309062.

Adding to 1213021012 its reverse (2101203121), we get a palindrome (3314224133).

The spelling of 1213021012 in words is "one billion, two hundred thirteen million, twenty-one thousand, twelve".