21269007 has 16 divisors (see below), whose sum is σ = 32527360. Its totient is φ = 13721400.

The previous prime is 21268993. The next prime is 21269009. The reversal of 21269007 is 70096212.

It is not a de Polignac number, because 21269007 - 2⁴ = 21268991 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21269009) 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, 11869 + ... + 13542.

It is an arithmetic number, because the mean of its divisors is an integer number (2032960).

Almost surely, 2^21269007 is an apocalyptic number.

21269007 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

21269007 is a deficient number, since it is larger than the sum of its proper divisors (11258353).

21269007 is a wasteful number, since it uses less digits than its factorization.

21269007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25451 (or 25445 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 21269007 is about 4611.8333664607. The cubic root of 21269007 is about 277.0654704121.

The spelling of 21269007 in words is "twenty-one million, two hundred sixty-nine thousand, seven".