21354666042 has 48 divisors (see below), whose sum is σ = 45431854272. Its totient is φ = 6690286080.

The previous prime is 21354666041. The next prime is 21354666071. The reversal of 21354666042 is 24066645312.

It is not an unprimeable number, because it can be changed into a prime (21354666041) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1311483 + ... + 1327665.

It is an arithmetic number, because the mean of its divisors is an integer number (946496964).

Almost surely, 2^21354666042 is an apocalyptic number.

21354666042 is an abundant number, since it is smaller than the sum of its proper divisors (24077188230).

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

21354666042 is a wasteful number, since it uses less digits than its factorization.

21354666042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16983 (or 16966 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 39.

The spelling of 21354666042 in words is "twenty-one billion, three hundred fifty-four million, six hundred sixty-six thousand, forty-two".