21962061 has 24 divisors (see below), whose sum is σ = 34978944. Its totient is φ = 13167360.

The previous prime is 21962051. The next prime is 21962063. The reversal of 21962061 is 16026912.

It is not a de Polignac number, because 21962061 - 2⁵ = 21962029 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21962063) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8460 + ... + 10746.

It is an arithmetic number, because the mean of its divisors is an integer number (1457456).

Almost surely, 2^21962061 is an apocalyptic number.

It is an amenable number.

21962061 is a deficient number, since it is larger than the sum of its proper divisors (13016883).

21962061 is a wasteful number, since it uses less digits than its factorization.

21962061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2401 (or 2398 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 21962061 is about 4686.3697037259. The cubic root of 21962061 is about 280.0427698271.

Adding to 21962061 its reverse (16026912), we get a palindrome (37988973).

The spelling of 21962061 in words is "twenty-one million, nine hundred sixty-two thousand, sixty-one".