21972598 has 16 divisors (see below), whose sum is σ = 34008480. Its totient is φ = 10639296.

The previous prime is 21972593. The next prime is 21972611. The reversal of 21972598 is 89527912.

It is a super-3 number, since 3×21972598³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21972593) 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, 18898 + ... + 20026.

It is an arithmetic number, because the mean of its divisors is an integer number (2125530).

Almost surely, 2^21972598 is an apocalyptic number.

21972598 is a deficient number, since it is larger than the sum of its proper divisors (12035882).

21972598 is a wasteful number, since it uses less digits than its factorization.

21972598 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1431.

The product of its digits is 90720, while the sum is 43.

The square root of 21972598 is about 4687.4937866625. The cubic root of 21972598 is about 280.0875491533.

The spelling of 21972598 in words is "twenty-one million, nine hundred seventy-two thousand, five hundred ninety-eight".