21347739722 has 4 divisors (see below), whose sum is σ = 32021609586. Its totient is φ = 10673869860.

The previous prime is 21347739713. The next prime is 21347739733. The reversal of 21347739722 is 22793774312.

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

It can be written as a sum of positive squares in only one way, i.e., 18925229761 + 2422509961 = 137569^2 + 49219^2 .

It is a super-3 number, since 3×21347739722³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5336934929 + ... + 5336934932.

Almost surely, 2^21347739722 is an apocalyptic number.

21347739722 is a deficient number, since it is larger than the sum of its proper divisors (10673869864).

21347739722 is a wasteful number, since it uses less digits than its factorization.

21347739722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10673869863.

The product of its digits is 889056, while the sum is 47.

The spelling of 21347739722 in words is "twenty-one billion, three hundred forty-seven million, seven hundred thirty-nine thousand, seven hundred twenty-two".