21402151606 has 12 divisors (see below), whose sum is σ = 35287018956. Its totient is φ = 9728250620.

The previous prime is 21402151543. The next prime is 21402151621. The reversal of 21402151606 is 60615120412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 44219080 + ... + 44219563.

It is an arithmetic number, because the mean of its divisors is an integer number (2940584913).

Almost surely, 2^21402151606 is an apocalyptic number.

21402151606 is a deficient number, since it is larger than the sum of its proper divisors (13884867350).

21402151606 is a wasteful number, since it uses less digits than its factorization.

21402151606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88438667 (or 88438656 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The spelling of 21402151606 in words is "twenty-one billion, four hundred two million, one hundred fifty-one thousand, six hundred six".