21510147492 has 144 divisors (see below), whose sum is σ = 57657600000. Its totient is φ = 6747668928.

The previous prime is 21510147473. The next prime is 21510147499. The reversal of 21510147492 is 29474101512.

21510147492 is a `hidden beast` number, since 2 + 15 + 10 + 147 + 492 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (21510147499) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 32640259 + ... + 32640917.

It is an arithmetic number, because the mean of its divisors is an integer number (400400000).

Almost surely, 2^21510147492 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 21510147492, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28828800000).

21510147492 is an abundant number, since it is smaller than the sum of its proper divisors (36147452508).

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

21510147492 is a wasteful number, since it uses less digits than its factorization.

21510147492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1270 (or 1265 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The spelling of 21510147492 in words is "twenty-one billion, five hundred ten million, one hundred forty-seven thousand, four hundred ninety-two".