401215121142 has 128 divisors (see below), whose sum is σ = 909117167616. Its totient is φ = 116985600000.

The previous prime is 401215121113. The next prime is 401215121147. The reversal of 401215121142 is 241121512104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401215121147) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 74063218 + ... + 74068634.

It is an arithmetic number, because the mean of its divisors is an integer number (7102477872).

Almost surely, 2^401215121142 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 401215121142, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (454558583808).

401215121142 is an abundant number, since it is smaller than the sum of its proper divisors (507902046474).

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

401215121142 is a wasteful number, since it uses less digits than its factorization.

401215121142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5846.

The product of its (nonzero) digits is 640, while the sum is 24.

Adding to 401215121142 its reverse (241121512104), we get a palindrome (642336633246).

The spelling of 401215121142 in words is "four hundred one billion, two hundred fifteen million, one hundred twenty-one thousand, one hundred forty-two".