402021124234312 has 128 divisors (see below), whose sum is σ = 866597680656000. Its totient is φ = 172918811197440.

The previous prime is 402021124234243. The next prime is 402021124234319. The reversal of 402021124234312 is 213432421120204.

It is a super-2 number, since 2×402021124234312² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (402021124234319) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12472329748 + ... + 12472361980.

It is an arithmetic number, because the mean of its divisors is an integer number (6770294380125).

Almost surely, 2^{402021124234312} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 402021124234312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (433298840328000).

402021124234312 is an abundant number, since it is smaller than the sum of its proper divisors (464576556421688).

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

402021124234312 is a wasteful number, since it uses less digits than its factorization.

402021124234312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40671 (or 40667 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 31.

Adding to 402021124234312 its reverse (213432421120204), we get a palindrome (615453545354516).

The spelling of 402021124234312 in words is "four hundred two trillion, twenty-one billion, one hundred twenty-four million, two hundred thirty-four thousand, three hundred twelve".