21411551024 has 10 divisors (see below), whose sum is σ = 41484880140. Its totient is φ = 10705775504.

The previous prime is 21411550999. The next prime is 21411551027. The reversal of 21411551024 is 42015511412.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21411550984 and 21411551002.

It is not an unprimeable number, because it can be changed into a prime (21411551027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 669110954 + ... + 669110985.

It is an arithmetic number, because the mean of its divisors is an integer number (4148488014).

Almost surely, 2^21411551024 is an apocalyptic number.

It is an amenable number.

21411551024 is a deficient number, since it is larger than the sum of its proper divisors (20073329116).

21411551024 is a wasteful number, since it uses less digits than its factorization.

21411551024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1338221947 (or 1338221941 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 26.

The spelling of 21411551024 in words is "twenty-one billion, four hundred eleven million, five hundred fifty-one thousand, twenty-four".