21422101 has 6 divisors (see below), whose sum is σ = 22609302. Its totient is φ = 20294280.

The previous prime is 21422099. The next prime is 21422117. The reversal of 21422101 is 10122412.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 13727025 + 7695076 = 3705^2 + 2774^2 .

It is not a de Polignac number, because 21422101 - 2¹ = 21422099 is a prime.

It is a super-2 number, since 2×21422101² = 917812822508402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21422501) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 29310 + ... + 30031.

It is an arithmetic number, because the mean of its divisors is an integer number (3768217).

Almost surely, 2^21422101 is an apocalyptic number.

It is an amenable number.

21422101 is a deficient number, since it is larger than the sum of its proper divisors (1187201).

21422101 is an equidigital number, since it uses as much as digits as its factorization.

21422101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59379 (or 59360 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 21422101 is about 4628.4015599341. The cubic root of 21422101 is about 277.7286528180.

Adding to 21422101 its reverse (10122412), we get a palindrome (31544513).

The spelling of 21422101 in words is "twenty-one million, four hundred twenty-two thousand, one hundred one".