21422037 has 32 divisors (see below), whose sum is σ = 35481600. Its totient is φ = 11194560.

The previous prime is 21422029. The next prime is 21422053. The reversal of 21422037 is 73022412.

It is not a de Polignac number, because 21422037 - 2³ = 21422029 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21422077) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35464 + ... + 36062.

It is an arithmetic number, because the mean of its divisors is an integer number (1108800).

Almost surely, 2^21422037 is an apocalyptic number.

It is an amenable number.

21422037 is a deficient number, since it is larger than the sum of its proper divisors (14059563).

21422037 is a wasteful number, since it uses less digits than its factorization.

21422037 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 753.

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 21422037 is about 4628.3946460949. The cubic root of 21422037 is about 277.7283762399.

Adding to 21422037 its reverse (73022412), we get a palindrome (94444449).

The spelling of 21422037 in words is "twenty-one million, four hundred twenty-two thousand, thirty-seven".