1321212000042 has 48 divisors (see below), whose sum is σ = 3124677991968. Its totient is φ = 400134803040.

The previous prime is 1321212000041. The next prime is 1321212000139. The reversal of 1321212000042 is 2400002121231.

It is a happy number.

It is a super-2 number, since 2×1321212000042² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1321211999979 and 1321212000024.

It is not an unprimeable number, because it can be changed into a prime (1321212000041) 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, 1595233 + ... + 2277540.

It is an arithmetic number, because the mean of its divisors is an integer number (65097458166).

Almost surely, 2^{1321212000042} is an apocalyptic number.

1321212000042 is an abundant number, since it is smaller than the sum of its proper divisors (1803465991926).

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

1321212000042 is a wasteful number, since it uses less digits than its factorization.

1321212000042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3874515 (or 3874512 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 1321212000042 its reverse (2400002121231), we get a palindrome (3721214121273).

The spelling of 1321212000042 in words is "one trillion, three hundred twenty-one billion, two hundred twelve million, forty-two", and thus it is an aban number.