21364272042 has 32 divisors (see below), whose sum is σ = 42904173312. Its totient is φ = 7092201984.

The previous prime is 21364272029. The next prime is 21364272043. The reversal of 21364272042 is 24027246312.

It is a junction number, because it is equal to n+sod(n) for n = 21364271994 and 21364272012.

It is not an unprimeable number, because it can be changed into a prime (21364272043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1921423 + ... + 1932509.

It is an arithmetic number, because the mean of its divisors is an integer number (1340755416).

Almost surely, 2^21364272042 is an apocalyptic number.

21364272042 is an abundant number, since it is smaller than the sum of its proper divisors (21539901270).

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

21364272042 is a wasteful number, since it uses less digits than its factorization.

21364272042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12382.

The product of its (nonzero) digits is 32256, while the sum is 33.

The spelling of 21364272042 in words is "twenty-one billion, three hundred sixty-four million, two hundred seventy-two thousand, forty-two".