221240010042 has 32 divisors (see below), whose sum is σ = 491780976960. Its totient is φ = 73726193520.

The previous prime is 221240010031. The next prime is 221240010073. The reversal of 221240010042 is 240010042122.

221240010042 is a `hidden beast` number, since 2 + 212 + 400 + 10 + 0 + 42 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 221240009997 and 221240010024.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 371884 + ... + 762087.

It is an arithmetic number, because the mean of its divisors is an integer number (15368155530).

Almost surely, 2^221240010042 is an apocalyptic number.

221240010042 is an abundant number, since it is smaller than the sum of its proper divisors (270540966918).

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

221240010042 is a wasteful number, since it uses less digits than its factorization.

221240010042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1137595 (or 1137589 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 221240010042 its reverse (240010042122), we get a palindrome (461250052164).

The spelling of 221240010042 in words is "two hundred twenty-one billion, two hundred forty million, ten thousand, forty-two".