21420154748 has 12 divisors (see below), whose sum is σ = 39115065360. Its totient is φ = 10244421792.

The previous prime is 21420154747. The next prime is 21420154807. The reversal of 21420154748 is 84745102412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21420154747) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116413793 + ... + 116413976.

It is an arithmetic number, because the mean of its divisors is an integer number (3259588780).

Almost surely, 2^21420154748 is an apocalyptic number.

It is an amenable number.

21420154748 is a deficient number, since it is larger than the sum of its proper divisors (17694910612).

21420154748 is a wasteful number, since it uses less digits than its factorization.

21420154748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232827796 (or 232827794 counting only the distinct ones).

The product of its (nonzero) digits is 71680, while the sum is 38.

The spelling of 21420154748 in words is "twenty-one billion, four hundred twenty million, one hundred fifty-four thousand, seven hundred forty-eight".