400021012142 has 4 divisors (see below), whose sum is σ = 600031518216. Its totient is φ = 200010506070.

The previous prime is 400021012121. The next prime is 400021012213. The reversal of 400021012142 is 241210120004.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×400021012142² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 400021012142.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100005253034 + ... + 100005253037.

It is an arithmetic number, because the mean of its divisors is an integer number (150007879554).

Almost surely, 2^400021012142 is an apocalyptic number.

400021012142 is a deficient number, since it is larger than the sum of its proper divisors (200010506074).

400021012142 is a wasteful number, since it uses less digits than its factorization.

400021012142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200010506073.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 400021012142 its reverse (241210120004), we get a palindrome (641231132146).

The spelling of 400021012142 in words is "four hundred billion, twenty-one million, twelve thousand, one hundred forty-two".