21205962 has 40 divisors (see below), whose sum is σ = 47811456. Its totient is φ = 7024968.

The previous prime is 21205927. The next prime is 21205973. The reversal of 21205962 is 26950212.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 35833 + ... + 36419.

Almost surely, 2^21205962 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21205962, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23905728).

21205962 is an abundant number, since it is smaller than the sum of its proper divisors (26605494).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21205962 is a wasteful number, since it uses less digits than its factorization.

21205962 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 824 (or 815 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 21205962 is about 4604.9931596040. The cubic root of 21205962 is about 276.7914428870.

The spelling of 21205962 in words is "twenty-one million, two hundred five thousand, nine hundred sixty-two".