21699450 has 36 divisors (see below), whose sum is σ = 58300398. Its totient is φ = 5786400.

The previous prime is 21699449. The next prime is 21699481. The reversal of 21699450 is 5499612.

It can be written as a sum of positive squares in 3 ways, for example, as 9941409 + 11758041 = 3153^2 + 3429^2 .

It is a super-2 number, since 2×21699450² = 941732260605000, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 23661 + ... + 24560.

Almost surely, 2^21699450 is an apocalyptic number.

21699450 is an abundant number, since it is smaller than the sum of its proper divisors (36600948).

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

21699450 is a wasteful number, since it uses less digits than its factorization.

21699450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48239 (or 48231 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 21699450 is about 4658.2668450831. The cubic root of 21699450 is about 278.9220887011.

The spelling of 21699450 in words is "twenty-one million, six hundred ninety-nine thousand, four hundred fifty".