21997062 has 64 divisors (see below), whose sum is σ = 51840000. Its totient is φ = 6899904.

The previous prime is 21997061. The next prime is 21997069. The reversal of 21997062 is 26079912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21997061) 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, 110439 + ... + 110637.

It is an arithmetic number, because the mean of its divisors is an integer number (810000).

Almost surely, 2^21997062 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21997062, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25920000).

21997062 is an abundant number, since it is smaller than the sum of its proper divisors (29842938).

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

21997062 is a wasteful number, since it uses less digits than its factorization.

21997062 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322 (or 316 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 21997062 is about 4690.1025575141. The cubic root of 21997062 is about 280.1914591897.

It can be divided in two parts, 2199 and 7062, that added together give a cube (9261 = 21³).

The spelling of 21997062 in words is "twenty-one million, nine hundred ninety-seven thousand, sixty-two".