1212420020 has 96 divisors (see below), whose sum is σ = 3137944320. Its totient is φ = 384168960.

The previous prime is 1212420019. The next prime is 1212420047. The reversal of 1212420020 is 200242121.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 1212419977 and 1212420004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 103502 + ... + 114618.

It is an arithmetic number, because the mean of its divisors is an integer number (32686920).

Almost surely, 2^1212420020 is an apocalyptic number.

1212420020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1212420020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1568972160).

1212420020 is an abundant number, since it is smaller than the sum of its proper divisors (1925524300).

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

1212420020 is a wasteful number, since it uses less digits than its factorization.

1212420020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11193 (or 11191 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 1212420020 is about 34819.8222281504. The cubic root of 1212420020 is about 1066.3121710456.

Adding to 1212420020 its reverse (200242121), we get a palindrome (1412662141).

The spelling of 1212420020 in words is "one billion, two hundred twelve million, four hundred twenty thousand, twenty".