61221432 has 32 divisors (see below), whose sum is σ = 153622800. Its totient is φ = 20331264.

The previous prime is 61221389. The next prime is 61221443. The reversal of 61221432 is 23412216.

It is a super-2 number, since 2×61221432² = 7496127472261248, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 61221399 and 61221408.

It is a congruent number.

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, 2044 + ... + 11252.

Almost surely, 2^61221432 is an apocalyptic number.

It is an amenable number.

61221432 is an abundant number, since it is smaller than the sum of its proper divisors (92401368).

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

61221432 is a wasteful number, since it uses less digits than its factorization.

61221432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9495 (or 9491 counting only the distinct ones).

The product of its digits is 576, while the sum is 21.

The square root of 61221432 is about 7824.4125658097. The cubic root of 61221432 is about 394.1254635781.

Adding to 61221432 its reverse (23412216), we get a palindrome (84633648).

The spelling of 61221432 in words is "sixty-one million, two hundred twenty-one thousand, four hundred thirty-two".