21486212 has 36 divisors (see below), whose sum is σ = 41827968. Its totient is φ = 9649200.

The previous prime is 21486211. The next prime is 21486221. The reversal of 21486212 is 21268412.

It is a happy number.

It is a super-2 number, since 2×21486212² = 923314612217888, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21486211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 49637 + ... + 50067.

It is an arithmetic number, because the mean of its divisors is an integer number (1161888).

Almost surely, 2^21486212 is an apocalyptic number.

21486212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21486212 is a deficient number, since it is larger than the sum of its proper divisors (20341756).

21486212 is a wasteful number, since it uses less digits than its factorization.

21486212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560 (or 547 counting only the distinct ones).

The product of its digits is 1536, while the sum is 26.

The square root of 21486212 is about 4635.3222110227. The cubic root of 21486212 is about 278.0054343951.

The spelling of 21486212 in words is "twenty-one million, four hundred eighty-six thousand, two hundred twelve".