21246429204 has 972 divisors, whose sum is σ = 80797691520. Its totient is φ = 4670265600.

The previous prime is 21246429203. The next prime is 21246429233. The reversal of 21246429204 is 40292464212.

21246429204 is a `hidden beast` number, since 2 + 1 + 2 + 4 + 642 + 9 + 2 + 0 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21246429203) by changing a digit.

It is a polite number, since it can be written in 323 ways as a sum of consecutive naturals, for example, 685368669 + ... + 685368699.

Almost surely, 2^21246429204 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21246429204, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40398845760).

21246429204 is an abundant number, since it is smaller than the sum of its proper divisors (59551262316).

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

21246429204 is a wasteful number, since it uses less digits than its factorization.

21246429204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122 (or 86 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 36.

The spelling of 21246429204 in words is "twenty-one billion, two hundred forty-six million, four hundred twenty-nine thousand, two hundred four".