21601430 has 32 divisors (see below), whose sum is σ = 39896064. Its totient is φ = 8418816.

The previous prime is 21601429. The next prime is 21601453. The reversal of 21601430 is 3410612.

It is a junction number, because it is equal to n+sod(n) for n = 21601399 and 21601408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92594 + ... + 92826.

It is an arithmetic number, because the mean of its divisors is an integer number (1246752).

Almost surely, 2^21601430 is an apocalyptic number.

21601430 is a deficient number, since it is larger than the sum of its proper divisors (18294634).

21601430 is a wasteful number, since it uses less digits than its factorization.

21601430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 21601430 is about 4647.7338564079. The cubic root of 21601430 is about 278.5014756886.

The spelling of 21601430 in words is "twenty-one million, six hundred one thousand, four hundred thirty".