21349701 has 12 divisors (see below), whose sum is σ = 30942912. Its totient is φ = 14184936.

The previous prime is 21349697. The next prime is 21349717. The reversal of 21349701 is 10794312.

It is not a de Polignac number, because 21349701 - 2² = 21349697 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21349001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1101 + ... + 6626.

It is an arithmetic number, because the mean of its divisors is an integer number (2578576).

Almost surely, 2^21349701 is an apocalyptic number.

It is an amenable number.

21349701 is a deficient number, since it is larger than the sum of its proper divisors (9593211).

21349701 is a wasteful number, since it uses less digits than its factorization.

21349701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8040 (or 8037 counting only the distinct ones).

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

The square root of 21349701 is about 4620.5736656826. The cubic root of 21349701 is about 277.4154210220.

The spelling of 21349701 in words is "twenty-one million, three hundred forty-nine thousand, seven hundred one".