1231221404000 has 96 divisors (see below), whose sum is σ = 3457269781056. Its totient is φ = 422133043200.

The previous prime is 1231221403991. The next prime is 1231221404003. The reversal of 1231221404000 is 4041221321.

It is a super-2 number, since 2×1231221404000² (a number of 25 digits) contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231221404003) 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, 21958097 + ... + 22014096.

It is an arithmetic number, because the mean of its divisors is an integer number (36013226886).

Almost surely, 2^{1231221404000} is an apocalyptic number.

1231221404000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231221404000 is an abundant number, since it is smaller than the sum of its proper divisors (2226048377056).

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

1231221404000 is an equidigital number, since it uses as much as digits as its factorization.

1231221404000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43972225 (or 43972207 counting only the distinct ones).

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

Adding to 1231221404000 its reverse (4041221321), we get a palindrome (1235262625321).

The spelling of 1231221404000 in words is "one trillion, two hundred thirty-one billion, two hundred twenty-one million, four hundred four thousand".