21532998 has 16 divisors (see below), whose sum is σ = 43493616. Its totient is φ = 7106400.

The previous prime is 21532997. The next prime is 21533009. The reversal of 21532998 is 89923512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21532997) 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, 17161 + ... + 18372.

It is an arithmetic number, because the mean of its divisors is an integer number (2718351).

Almost surely, 2^21532998 is an apocalyptic number.

21532998 is an abundant number, since it is smaller than the sum of its proper divisors (21960618).

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

21532998 is a wasteful number, since it uses less digits than its factorization.

21532998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35639.

The product of its digits is 38880, while the sum is 39.

The square root of 21532998 is about 4640.3661493464. The cubic root of 21532998 is about 278.2070727444.

It can be divided in two parts, 2153 and 2998, that added together give a triangular number (5151 = T₁₀₁).

The spelling of 21532998 in words is "twenty-one million, five hundred thirty-two thousand, nine hundred ninety-eight".