21253100262460 has 96 divisors (see below), whose sum is σ = 54266289396480. Its totient is φ = 6890957337600.

The previous prime is 21253100262451. The next prime is 21253100262463. The reversal of 21253100262460 is 6426200135212.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21253100262463) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 149472286 + ... + 149614405.

It is an arithmetic number, because the mean of its divisors is an integer number (565273847880).

Almost surely, 2^{21253100262460} is an apocalyptic number.

21253100262460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21253100262460 is an abundant number, since it is smaller than the sum of its proper divisors (33013189134020).

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

21253100262460 is a wasteful number, since it uses less digits than its factorization.

21253100262460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299086747 (or 299086745 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

Adding to 21253100262460 its reverse (6426200135212), we get a palindrome (27679300397672).

The spelling of 21253100262460 in words is "twenty-one trillion, two hundred fifty-three billion, one hundred million, two hundred sixty-two thousand, four hundred sixty".