21623013140 has 48 divisors (see below), whose sum is σ = 46441600128. Its totient is φ = 8453637504.

The previous prime is 21623013131. The next prime is 21623013169. The reversal of 21623013140 is 4131032612.

It is a super-2 number, since 2×21623013140² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 239999 + ... + 317561.

It is an arithmetic number, because the mean of its divisors is an integer number (967533336).

Almost surely, 2^21623013140 is an apocalyptic number.

21623013140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21623013140 is an abundant number, since it is smaller than the sum of its proper divisors (24818586988).

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

21623013140 is a wasteful number, since it uses less digits than its factorization.

21623013140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77888 (or 77886 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 21623013140 its reverse (4131032612), we get a palindrome (25754045752).

The spelling of 21623013140 in words is "twenty-one billion, six hundred twenty-three million, thirteen thousand, one hundred forty".