21870551852 has 24 divisors (see below), whose sum is σ = 39314357376. Its totient is φ = 10637975808.

The previous prime is 21870551839. The next prime is 21870551861. The reversal of 21870551852 is 25815507812.

It is a happy number.

It is a super-2 number, since 2×21870551852² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1715333 + ... + 1728035.

It is an arithmetic number, because the mean of its divisors is an integer number (1638098224).

Almost surely, 2^21870551852 is an apocalyptic number.

It is an amenable number.

21870551852 is a deficient number, since it is larger than the sum of its proper divisors (17443805524).

21870551852 is a wasteful number, since it uses less digits than its factorization.

21870551852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24377 (or 24375 counting only the distinct ones).

The product of its (nonzero) digits is 224000, while the sum is 44.

The spelling of 21870551852 in words is "twenty-one billion, eight hundred seventy million, five hundred fifty-one thousand, eight hundred fifty-two".