21613062492 has 216 divisors, whose sum is σ = 66186629600. Its totient is φ = 6175160712.

The previous prime is 21613062491. The next prime is 21613062503. The reversal of 21613062492 is 29426031612.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

21613062492 is a `hidden beast` number, since 2 + 16 + 13 + 0 + 624 + 9 + 2 = 666.

It is a super-3 number, since 3×21613062492³ (a number of 32 digits) contains 333 as substring.

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 (21613062491) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 3087580353 + ... + 3087580359.

Almost surely, 2^21613062492 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 21613062492, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33093314800).

21613062492 is an abundant number, since it is smaller than the sum of its proper divisors (44573567108).

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

21613062492 is an frugal number, since it uses more digits than its factorization.

21613062492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77 (or 12 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The spelling of 21613062492 in words is "twenty-one billion, six hundred thirteen million, sixty-two thousand, four hundred ninety-two".