421561541642 has 16 divisors (see below), whose sum is σ = 641830148352. Its totient is φ = 207623544240.

The previous prime is 421561541633. The next prime is 421561541651. The reversal of 421561541642 is 246145165124.

It is an interprime number because it is at equal distance from previous prime (421561541633) and next prime (421561541651).

It is a self number, because there is not a number n which added to its sum of digits gives 421561541642.

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, 1189133 + ... + 1502384.

It is an arithmetic number, because the mean of its divisors is an integer number (40114384272).

Almost surely, 2^421561541642 is an apocalyptic number.

421561541642 is a deficient number, since it is larger than the sum of its proper divisors (220268606710).

421561541642 is a wasteful number, since it uses less digits than its factorization.

421561541642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2692693.

The product of its digits is 230400, while the sum is 41.

The spelling of 421561541642 in words is "four hundred twenty-one billion, five hundred sixty-one million, five hundred forty-one thousand, six hundred forty-two".