21379701 has 12 divisors (see below), whose sum is σ = 32610912. Its totient is φ = 12204864.

The previous prime is 21379697. The next prime is 21379703. The reversal of 21379701 is 10797312.

It is not a de Polignac number, because 21379701 - 2² = 21379697 is a prime.

It is a super-2 number, since 2×21379701² = 914183229698802, which contains 22 as substring.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21379703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20685 + ... + 21693.

It is an arithmetic number, because the mean of its divisors is an integer number (2717576).

Almost surely, 2^21379701 is an apocalyptic number.

21379701 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21379701 is a deficient number, since it is larger than the sum of its proper divisors (11231211).

21379701 is an frugal number, since it uses more digits than its factorization.

21379701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2028 (or 1019 counting only the distinct ones).

The product of its (nonzero) digits is 2646, while the sum is 30.

The square root of 21379701 is about 4623.8188762104. The cubic root of 21379701 is about 277.5452989925.

The spelling of 21379701 in words is "twenty-one million, three hundred seventy-nine thousand, seven hundred one".