1213220421020 has 48 divisors (see below), whose sum is σ = 2596831731648. Its totient is φ = 475948761600.

The previous prime is 1213220420987. The next prime is 1213220421029. The reversal of 1213220421020 is 201240223121.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1213220420983 and 1213220421001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213220421029) 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, 2555345 + ... + 2992695.

It is an arithmetic number, because the mean of its divisors is an integer number (54100661076).

Almost surely, 2^{1213220421020} is an apocalyptic number.

1213220421020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213220421020 is an abundant number, since it is smaller than the sum of its proper divisors (1383611310628).

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

1213220421020 is a wasteful number, since it uses less digits than its factorization.

1213220421020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440030 (or 440028 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 1213220421020 its reverse (201240223121), we get a palindrome (1414460644141).

The spelling of 1213220421020 in words is "one trillion, two hundred thirteen billion, two hundred twenty million, four hundred twenty-one thousand, twenty".