42001222209978 has 48 divisors (see below), whose sum is σ = 88190403013440. Its totient is φ = 13334218721472.

The previous prime is 42001222209901. The next prime is 42001222209997. The reversal of 42001222209978 is 87990222210024.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27657238 + ... + 29136321.

It is an arithmetic number, because the mean of its divisors is an integer number (1837300062780).

Almost surely, 2^{42001222209978} is an apocalyptic number.

42001222209978 is an abundant number, since it is smaller than the sum of its proper divisors (46189180803462).

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

42001222209978 is a wasteful number, since it uses less digits than its factorization.

42001222209978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56793843 (or 56793820 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 48.

The spelling of 42001222209978 in words is "forty-two trillion, one billion, two hundred twenty-two million, two hundred nine thousand, nine hundred seventy-eight".