21305274342 has 32 divisors (see below), whose sum is σ = 46839095424. Its totient is φ = 6406857600.

The previous prime is 21305274337. The next prime is 21305274379. The reversal of 21305274342 is 24347250312.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

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, 1223443 + ... + 1240734.

It is an arithmetic number, because the mean of its divisors is an integer number (1463721732).

Almost surely, 2^21305274342 is an apocalyptic number.

21305274342 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21305274342 is an abundant number, since it is smaller than the sum of its proper divisors (25533821082).

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

21305274342 is a wasteful number, since it uses less digits than its factorization.

21305274342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2464324.

The product of its (nonzero) digits is 40320, while the sum is 33.

The spelling of 21305274342 in words is "twenty-one billion, three hundred five million, two hundred seventy-four thousand, three hundred forty-two".