21030552052 has 12 divisors (see below), whose sum is σ = 36807734880. Its totient is φ = 10514056376.

The previous prime is 21030552047. The next prime is 21030552061. The reversal of 21030552052 is 25025503012.

It is a happy number.

It is a super-2 number, since 2×21030552052² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 265552 + ... + 335527.

It is an arithmetic number, because the mean of its divisors is an integer number (3067311240).

Almost surely, 2^21030552052 is an apocalyptic number.

It is an amenable number.

21030552052 is a deficient number, since it is larger than the sum of its proper divisors (15777182828).

21030552052 is a wasteful number, since it uses less digits than its factorization.

21030552052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609830 (or 609828 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 25.

The spelling of 21030552052 in words is "twenty-one billion, thirty million, five hundred fifty-two thousand, fifty-two".