21396641702 has 4 divisors (see below), whose sum is σ = 32094962556. Its totient is φ = 10698320850.

The previous prime is 21396641689. The next prime is 21396641771. The reversal of 21396641702 is 20714669312.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×21396641702² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21396641702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5349160424 + ... + 5349160427.

It is an arithmetic number, because the mean of its divisors is an integer number (8023740639).

Almost surely, 2^21396641702 is an apocalyptic number.

21396641702 is a deficient number, since it is larger than the sum of its proper divisors (10698320854).

21396641702 is a wasteful number, since it uses less digits than its factorization.

21396641702 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10698320853.

The product of its (nonzero) digits is 108864, while the sum is 41.

The spelling of 21396641702 in words is "twenty-one billion, three hundred ninety-six million, six hundred forty-one thousand, seven hundred two".