1266682021 has 4 divisors (see below), whose sum is σ = 1381834944. Its totient is φ = 1151529100.

The previous prime is 1266681991. The next prime is 1266682031. The reversal of 1266682021 is 1202866621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1266682021 - 2⁵ = 1266681989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266682031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57576445 + ... + 57576466.

It is an arithmetic number, because the mean of its divisors is an integer number (345458736).

Almost surely, 2^1266682021 is an apocalyptic number.

1266682021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1266682021 is a deficient number, since it is larger than the sum of its proper divisors (115152923).

1266682021 is a wasteful number, since it uses less digits than its factorization.

1266682021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115152922.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 1266682021 is about 35590.4765492119. The cubic root of 1266682021 is about 1081.9882273847.

The spelling of 1266682021 in words is "one billion, two hundred sixty-six million, six hundred eighty-two thousand, twenty-one".