21400652460 has 96 divisors (see below), whose sum is σ = 65808288000. Its totient is φ = 5153194240.

The previous prime is 21400652459. The next prime is 21400652461. The reversal of 21400652460 is 6425600412.

It is an interprime number because it is at equal distance from previous prime (21400652459) and next prime (21400652461).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (21400652461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10470 + ... + 207149.

It is an arithmetic number, because the mean of its divisors is an integer number (685503000).

Almost surely, 2^21400652460 is an apocalyptic number.

21400652460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21400652460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32904144000).

21400652460 is an abundant number, since it is smaller than the sum of its proper divisors (44407635540).

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

21400652460 is a wasteful number, since it uses less digits than its factorization.

21400652460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217791 (or 217789 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The spelling of 21400652460 in words is "twenty-one billion, four hundred million, six hundred fifty-two thousand, four hundred sixty".