21268061386 has 16 divisors (see below), whose sum is σ = 37479381408. Its totient is φ = 8923662000.

The previous prime is 21268061377. The next prime is 21268061389. The reversal of 21268061386 is 68316086212.

It is a super-4 number, since 4×21268061386⁴ (a number of 42 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (21268061389) 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, 37181640 + ... + 37182211.

It is an arithmetic number, because the mean of its divisors is an integer number (2342461338).

Almost surely, 2^21268061386 is an apocalyptic number.

21268061386 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21268061386 is a deficient number, since it is larger than the sum of its proper divisors (16211320022).

21268061386 is a wasteful number, since it uses less digits than its factorization.

21268061386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74363877.

The product of its (nonzero) digits is 165888, while the sum is 43.

The spelling of 21268061386 in words is "twenty-one billion, two hundred sixty-eight million, sixty-one thousand, three hundred eighty-six".