21020727342 has 32 divisors (see below), whose sum is σ = 43492938912. Its totient is φ = 6767760384.

The previous prime is 21020727269. The next prime is 21020727359. The reversal of 21020727342 is 24372702012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 315163 + ... + 375990.

It is an arithmetic number, because the mean of its divisors is an integer number (1359154341).

Almost surely, 2^21020727342 is an apocalyptic number.

21020727342 is an abundant number, since it is smaller than the sum of its proper divisors (22472211570).

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

21020727342 is a wasteful number, since it uses less digits than its factorization.

21020727342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691332.

The product of its (nonzero) digits is 9408, while the sum is 30.

The spelling of 21020727342 in words is "twenty-one billion, twenty million, seven hundred twenty-seven thousand, three hundred forty-two".