21211701 has 8 divisors (see below), whose sum is σ = 32322624. Its totient is φ = 12120960.

The previous prime is 21211643. The next prime is 21211709. The reversal of 21211701 is 10711212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21211701 - 2¹¹ = 21209653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21211709) 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, 505020 + ... + 505061.

It is an arithmetic number, because the mean of its divisors is an integer number (4040328).

Almost surely, 2^21211701 is an apocalyptic number.

21211701 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21211701 is a deficient number, since it is larger than the sum of its proper divisors (11110923).

21211701 is a wasteful number, since it uses less digits than its factorization.

21211701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010091.

The product of its (nonzero) digits is 28, while the sum is 15.

The square root of 21211701 is about 4605.6162454117. The cubic root of 21211701 is about 276.8164101236.

Adding to 21211701 its reverse (10711212), we get a palindrome (31922913).

It can be divided in two parts, 21211 and 701, that added together give a palindrome (21912).

The spelling of 21211701 in words is "twenty-one million, two hundred eleven thousand, seven hundred one".