3821224121820 has 72 divisors (see below), whose sum is σ = 13246910293344. Its totient is φ = 873422656128.

The previous prime is 3821224121809. The next prime is 3821224121821. The reversal of 3821224121820 is 281214221283.

It is a happy number.

3821224121820 is a `hidden beast` number, since 3 + 8 + 212 + 2 + 412 + 1 + 8 + 20 = 666.

It is a super-2 number, since 2×3821224121820² (a number of 26 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3821224121821) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1516357519 + ... + 1516360038.

Almost surely, 2^{3821224121820} is an apocalyptic number.

3821224121820 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3821224121820 is an abundant number, since it is smaller than the sum of its proper divisors (9425686171524).

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

3821224121820 is a wasteful number, since it uses less digits than its factorization.

3821224121820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3032717579 (or 3032717574 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 36.

The spelling of 3821224121820 in words is "three trillion, eight hundred twenty-one billion, two hundred twenty-four million, one hundred twenty-one thousand, eight hundred twenty".