21380507601 has 16 divisors (see below), whose sum is σ = 30438583296. Its totient is φ = 13316876496.

The previous prime is 21380507527. The next prime is 21380507633. The reversal of 21380507601 is 10670508312.

It is not a de Polignac number, because 21380507601 - 2¹⁰ = 21380506577 is a prime.

It is a super-2 number, since 2×21380507601² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21380507501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3600085 + ... + 3606018.

It is an arithmetic number, because the mean of its divisors is an integer number (1902411456).

Almost surely, 2^21380507601 is an apocalyptic number.

It is an amenable number.

21380507601 is a deficient number, since it is larger than the sum of its proper divisors (9058075695).

21380507601 is a wasteful number, since it uses less digits than its factorization.

21380507601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7206172.

The product of its (nonzero) digits is 10080, while the sum is 33.

The spelling of 21380507601 in words is "twenty-one billion, three hundred eighty million, five hundred seven thousand, six hundred one".