21362727621 has 8 divisors (see below), whose sum is σ = 28496068000. Its totient is φ = 14235602832.

The previous prime is 21362727619. The next prime is 21362727623. The reversal of 21362727621 is 12672726312.

It is an interprime number because it is at equal distance from previous prime (21362727619) and next prime (21362727623).

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

It is not a de Polignac number, because 21362727621 - 2¹ = 21362727619 is a prime.

It is a super-2 number, since 2×21362727621² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21362727621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21362727623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1545871 + ... + 1559628.

It is an arithmetic number, because the mean of its divisors is an integer number (3562008500).

Almost surely, 2^21362727621 is an apocalyptic number.

It is an amenable number.

21362727621 is a deficient number, since it is larger than the sum of its proper divisors (7133340379).

21362727621 is a wasteful number, since it uses less digits than its factorization.

21362727621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3107795.

The product of its digits is 84672, while the sum is 39.

The spelling of 21362727621 in words is "twenty-one billion, three hundred sixty-two million, seven hundred twenty-seven thousand, six hundred twenty-one".