21401015542 has 8 divisors (see below), whose sum is σ = 32153893056. Its totient is φ = 10683051192.

The previous prime is 21401015513. The next prime is 21401015627. The reversal of 21401015542 is 24551010412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8726758 + ... + 8729209.

It is an arithmetic number, because the mean of its divisors is an integer number (4019236632).

Almost surely, 2^21401015542 is an apocalyptic number.

21401015542 is a deficient number, since it is larger than the sum of its proper divisors (10752877514).

21401015542 is a wasteful number, since it uses less digits than its factorization.

21401015542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17456582.

The product of its (nonzero) digits is 1600, while the sum is 25.

Adding to 21401015542 its reverse (24551010412), we get a palindrome (45952025954).

The spelling of 21401015542 in words is "twenty-one billion, four hundred one million, fifteen thousand, five hundred forty-two".