31220424420042 has 32 divisors (see below), whose sum is σ = 73357081156800. Its totient is φ = 8732985851520.

The previous prime is 31220424420041. The next prime is 31220424420043. The reversal of 31220424420042 is 24002442402213.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (31220424420041) and next prime (31220424420043).

It is a junction number, because it is equal to n+sod(n) for n = 31220424419991 and 31220424420009.

It is not an unprimeable number, because it can be changed into a prime (31220424420041) 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, 18193719667 + ... + 18193721382.

It is an arithmetic number, because the mean of its divisors is an integer number (2292408786150).

Almost surely, 2^{31220424420042} is an apocalyptic number.

31220424420042 is an abundant number, since it is smaller than the sum of its proper divisors (42136656736758).

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

31220424420042 is a wasteful number, since it uses less digits than its factorization.

31220424420042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36387441078.

The product of its (nonzero) digits is 24576, while the sum is 30.

Adding to 31220424420042 its reverse (24002442402213), we get a palindrome (55222866822255).

The spelling of 31220424420042 in words is "thirty-one trillion, two hundred twenty billion, four hundred twenty-four million, four hundred twenty thousand, forty-two".